Only in certain cases such as the ones described
Only in certain cases unlike the ones described
NO to the heck heck NO! This crap with titans bumping people out of getting power ammo has GOT to STOP BUNGIE! I can just be sitting there defending it for minutes when some idiot runs up and bumps be in the last 3 seconds to take it away. That's crap and there is no recourse. Note: I once had this happen, only to stop and let the enemy destroy the guy. Then I killed the enemy and took it back while emoting on the idiot.
Two of my favorite things to do in Crucible is steal heavy ammo and try to shoot down the invisible ahamkara that are always overhead.
It's annoying, but after being pushed so many times, now i deliberately put my void shield and get out my freaking way!!!!!