I have noticed many times when scorch doesn't work properly. Before you lot start saying warlocks are op and scorch is fine I have to say sometimes enemies don't even get set alight! (PvP only) and during PvP my perk for scorch (flame shield) also doesn't work properly (PvP and PvE) it happens at least 1/4 of the time and I'm very sure many other sunsingers will agree with me
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Warlocks are highly op bud..just be happy and deal with your few bugs