Reaper has single-handedly taken down twenty foot tall mech units and walked away from it with little more than a growl. It had lasers! As long as there are organics around to harvest he'll be fine but will she be okay with him leaving desiccated husks in his wake? The Robobrains aren't terribly similar to what happened to make him Reaper but it's close enough he'd be happy to help shut it down.

Gabriel and supermutants...well, that could've easily been what the SEP did to him. It's a sobering thought.