Felt carefully listened to Whitney's explanation. Of course, he didn't really know about half of the things she was talking about, but the basic idea got through just fine. Apparently Trainers were a very common thing where Whitney came from, as were the creatures she carried around with here. Not that this made her abilities and prestations any less adirable in Felt's eyes, though. If anything, Whitney's world itself became an object of awe for the young swordsman.
As for why she refused the medicine, Felt didn't know. 'PP'? What were those supposed to be anyway? He could assume that it had something to to do with mana, but he had no way to verify this other than asking this. Before he could actually do so though, Whitney suddenly started to cry, apparently being overcome by the fear of death -- something which, of course, was very understandable.
"Don't worry, I'll protect you," Felt started. "I'm not going to let anyone die if I can help it." Even though the two might be enemies sometime in the future, the young alchemist just couldn't just stand aside when someone was so obviously in need of help. At the same time, deep down he knew that he couldn't help everyone around him and still fulfill his goal of saving Eden.
Not that he could spend much time pondering on it, though, because moments afterwards this... thing appeared, sending a wave of some kind of horrible negative energy outwards, this in tun sending a shiver across Felt's entire body. In a reflex, he put himself in between the rising structure and Whitney, not wanting to back out on his words moments after having spoken them. "What the...," the alchemist muttered, staring at the giant structure in the distance. Okay, this is most definitely bad, he thought, the surge of power slowly giving him a headache, not to mention being nervous about what the hell was happening. What kind of creature would be powerful enough to do this?
As sudden as the tower's appearance was, just as suddenly did the flow of power surging out from it end, causing Felt to momentarily tremble. "What... was that?," he muttered, more to himself than actually expecting an answer. Even his Azoth, normally quite ready to make snarky comments about questions like these, was too stunned to respond -- something which was a bad sign in and of itself, even though Felt wasn't really clear of mind enough to take notice of this at the moment.
"Whitney, look out," the young swordsman told his newfound protegé after regaining his composure. "I don't know what it is, but it's probably not good. Be ready for anything, including running." As rude as it might have been in other circumstances, Felt kept his back turned to Whitney the entire time, not wanting to turn away from the ominous structure.