[Well, no, his hands are definitely Not clean. Being a Demon King for a couple hundred years tends to disrupt that. Not to mention his own deeds after being reborn... but that's neither here nor there. More importantly:]

If you lot want to try that hard to kill one another then be my guest. The least I can do is take back what is mine. Make it a little less easy to find proper weapons.

[Not that Gladio doesn't have a point about anything being used as a weapon... and at least half the train roster not even needing a weapon to kill someone...himself included.]

...I'm pretty sure his ki isn't on the train anymore, or that it's being suppressed. I can't help you beyond that.

[Well, he probably could but...he's not sure how, or if he wants to at the moment.]