This can only happen if you kill everyone on enemy team except sage, enemy sage revives a fallen member, gets two orbs, kills your team except you, revives someone else, then you kill them, Has this happened to you (not counting custom)?

No other utility in the game gets activated by other utility. Trademark and alarm bot are smart enough to not trigger on other utility. Sentry turret also doesn't shoot at other utility. Skye dog, fade dog, boom bot, owl drone don't activat...