its like they impact their own barrels and kill you
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I experienced blowing myself up by shooting 2 grenades quickly I think they might have detonated one on the other maybe. Also, due to lag when on my screen I was over the wall shooting a GL the game thought I was in front of it thus killed me and my ghost was in front of the wall where the game thought I was not where my screen was showing me. So, yes bad programming.