Something funny happened to me in a game today. I threw a plasma grenade on an enemy, but it accidentally sticked on an ally that passed through me. My ally kept advancing towards the enemy until the grenade exploded. The enemy died, but my ally didn’t even lose his shield.
This could be used intentionally by a coordinated team. Stick a grenade on an ally and let him run towards a group of enemies. Might be very fun, albeit unrealistic and arguably unfair to those on the receiving end.