@IncredibleBee
Would Vincent have something like a mission control (aka Bridge Bunnies) helping him? I have an idea for my next post, but it kind of swings around this, so if not I'd have to rethink how to reveal the plot around that assassin.
Vincent's officially backed by the governments of several powerful countries. He would have a support team consisting of medics, scientists, engineers and the like to patch him up, repair his gear, and study any findings after each incursion (for example, all the monster gore stuck to his swords.) as well as provide him with intel relating to the city itself and anything they might discover about Youkai and what's best for fighting them. Ideally, yes, this would include a support team giving him info live via radio.
However, in my first post I wrote that radio transmissions couldn't pass between the human world and Crimson world, because to my knowledge they're in different dimensions. If we're gonna do this, I'd like an explanation for why radios could still connect to the human world, OR a decent idea for how technology can circumvent the problem, OR you really, really can't think of how to reveal the plot otherwise.
Also if you want a decent way to reveal assassin plot, Vincent's trying to chop the leader's arms and legs off so he can interrogate him.