I was playing legendary and I has a single bar of health with no shields and I was being attaaked by a red elite with full health and all I has was an assault rifle. Out of nowhere a grunt throws a grenade at me and it stuck to the elite's foot. So of course I ran away and survived.
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Hmm... it would have to be... I was sitting in the top of one of the Sidewinder bases, and my brother was trying to kill me with frag grenades. After a while, I noticed something bounce off my visor, and realised that his grenade hit me. If it didn't, it would have bounced off the weall behind me and killed me.