Right then, maybe this has gone far enough... That one seems to be talking so perhaps he doesn't want to die? And upon getting a bit closer, looks like... Still, can't be trusted without some leverage. Satan rushes forward, cannons blasting away though mostly aiming for arms and legs, shooting to hurt rather than kill and even sending some wide as Tatsu creeps closer. Assuming he got next to his foe, he'd place the gun right up to their head and begin speaking as his Persona watches closely.
"Hi there, well you sure are a decent assassin aren't you. Anyways, if you aren't too keen on this whole dying thing I can help with that, as long as you'll give me some info anyways. So what'll it be? And don't try anything, unless you think you can defend against a point blank 50 cal revolver to the skull and powerful magic at the same time with those wounds."
He isn't bluffing either, if even the slightest hostile move were taken the enemy would find themselves faced with a bullet to the back of the skull and a blade of almighty energy rushing for their chest. If they complied, however, Tatsuya would sigh and begin asking a few questions.
"Now, I feel like we got off on the wrong foot with the whole you killing people thing and me trying to kill you in case I was next. But hey, water under the bridge if you explain to me what the fuck happened to Tokyo and why you killed those two, my power is pretty good for fixing damage as well as causing it so just, be honest with me and I'll help out. What's to lose?"