He didn't one shot that titan and even if he did it's not different than other supers having the same capability, having a one hit kill grenade is no different that titans and their shoulder charge or the hunter wombo-combo. His super came back super fast when showing the ability recharges because he set the private PVP match to do so. I stopped watching because honestly I don't think he knows what he is talking about or pointing out.
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I went into private match myself against another warlock and the results of that super is insane. Most of the time, while hammer was active, I died in one hit to nova warp with 6 resilience. At first I thought it was a two hit super, but it’s a one hit.