Childe won't really care if he's helping them escape, but if that means directly interfering with a Kenoma (namely himself), I can easily see him making Matt's life extremely hard. Killing him wouldn't happen unless he actually really harmed a Kenoma, but decommissioning him I can certainly do if that's what you like.
Re: somehow both late and early - kenoma-on-kenoma violence?
Childe won't really care if he's helping them escape, but if that means directly interfering with a Kenoma (namely himself), I can easily see him making Matt's life extremely hard. Killing him wouldn't happen unless he actually really harmed a Kenoma, but decommissioning him I can certainly do if that's what you like.