This is pretty short and simple.
Bungie...please stop making Nova Bombs kill the user when they cast with their back against the wall. This is not a glitch or an isolated incident. It happens every...single...time. when the warlock reaches back for the animation when standing against a wall the bomb explodes on top of you instantly. Fix. Fix. Fix.
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It should kill you if you hit the nova bomb to the ceiling or a wall in front you. But it shouldn't recognise a wall behind you as an obstacles for Nova bomb that you are aiming to the front.