I would've raged.

lol epic. wonder how/who trigger that lms. if it was you, i didnt know that lms will attack the player which attacked it..

If you watch closely one of your team runs past it (assuming he is running Stalker Pro because it takes a while to go off after he runs past it) then you briefly see a red name appear in the corridoor, so again assuming he killed your team mate, who then respawned in the dome below you (which would explain why it hits the wall rather then hits you directly) which is what the IMS was aiming at.

Regardless of if you die or not an IMS will always go off and track the player a few times I've been hit by IMS from a large distance because of this .

A case of wrong place wrong time, annoyingly.