Alison Fintan
The golden Stand wasn't swayed by Alison's bluff, or at least not significantly. Jotaro respected his distance to Gold Experience and to Alison, but he also still had no trust or faith in them. Understandably so, but his threat was an even worse bluff than Alison's. She remained silent as Gold Experience took its turn to bluff, though Alison couldn't help but notice that this Stand User was considerably more mouthy than Jotaro or Alison had been so far. When the Stand began to walk back towards the door, towards Alison, she stealthily stepped out of its way. It was extremely unlikely the Stand was physically manifested at the moment so they probably wouldn't have bumped, but she still didn't know what its ability was in the slightest. It was yet to demonstrate anything, at least not visually or audibly. The temptation to suckerpunch the Stand was very brief, as it would 99 times out of 100 be a losing gamble. Though it looks thin, and when it wasn't putting on a front it was shocked by the scalpel. I'm positive I could knock its lights out if it was tangible when I swung, but this user isn't a rookie, she thought as she let the Stand pass by unharmed.
Once she took a few more steps, deliberately putting herself outside her own striking range and to the side of the confrontation to make a triangle between herself, Gold Experience, and Jotaro, she tightened her grip on the invisible object. "My original objective here was to collect information on the killer's Stand abilities," Alison spoke up, admitting her plan rather bluntly. She had already determined she didn't have much to gain by keeping that particular information close to her chest, whereas these two were potential allies to be made. "But after hearing what this Stand had to say my objective has changed. If you really can create a reliable lead to the killer then I'd stand to benefit from that information too. I have no attachment to this victim or their body beyond getting the most information out of it as possible." Alison made a brief pause to move a few more steps to the side, so as not to remain standing in the exact same spot for any long period of time. "I'm also not concerned with any consequences with the law. I have a very good lawyer, after all."
With this moment of levity she took a few more steps, but she also relaxed her arms and put her invisible object away. It was unlikely she would need it at this point. "I believe we could stand to benefit from an alliance. I have both information and capabilities that would be most useful, if we all share the same goal." A smirk formed on her invisible face. More like similar enough goal, she thought to herself before a serious expression returned. "As well, should your lead turn up empty, I can provide resources to make finding the next lead much quicker and easier. All this and more, but not for free..." She made a few more steps, coming closer to Jotaro this time. It was likely his vines could extend his reach so she didn't want to get too close to him, but she also wanted to be close enough that if she had to fight she could suckerpunch him first. She knew where his body was so there was no guessing game or predictions required to figure out his tangibility. He was a pretty big guy so it was unlikely she could shut him down with a single blow, but there was still a possibility. "But I think you two will find my demands quite agreeable for the value that I offer. From you, Mr. Jotaro, immunity from police interference or retribution. And from you, Mr... hmmm, I suppose I should start with your name... but from you my demands are access to the information your Stand provides from its lead. To fulfill my objectives I must identify, locate, and confront the killer myself, and so long as neither of you obstruct these objectives then I will gladly work with you and share my resources."
Of course it was quite likely they would strike up this deal. At least the unknown Stand user was likely to. Jotaro, on the other hand, seemed eager to find this killer but equally eager to uphold the law. The idea of breaking the law and getting away with it was probably not very appealing to him, so it was a bit of a gamble as to whether he wanted to catch the killer more than he wanted to fanatically bring criminals to justice. The decision to work with Alison wouldn't be such a no-brainer for someone in his position as a detective, but at the same time if the unknown user agreed to work together and he didn't then he would be in a very terrible spot. The threat of that possibility would hopefully weigh on his decision and motivate him to work with Alison. Ideally this alliance wouldn't need to last very long anyways: the golden Stand might possibly take them right to the killer directly and save tons of time and effort. If only it would be that easy...