Shamefully, I lost the plot.
The plot: The enemy ran around the corner, then my team mate appeared in my view almost immediately and I just thought the enemy had about-turned. He stopped as if to say "WTF are you doing?!" and then he got deaded. My bad.
Oh and I then got slotted by the bad guy.
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which is the reason I only use shot gun at a distance of 1cm - only way I can get kills.