Doesn't matter. Explosive Trap kills everything either way. Period.
ABSOLUTELY incorrect. Attacking with the Witchwood Imp into the Hench-Clan Burglar before playing any of the cards he had in hand at the time (Voidwalker, Witchwood Imp and Arch-Villain Rafaam) would've buffed the Argent Squire's Health to 3, that was lethal on the spot. However Viper did not know which secret it was, obviously. He chose to give himself a better chance against Misdirection and COMPLETELY disrespected Explosive Trap by playing not only the Voidwalker but also Witchwood Imp, which by the way was lethal the very next turn as Hunterace's deck did not run any copies of Fan of Knives. (I might be wrong on that one so if I am please do correct me but I remember hearing the casters say that.)
Worst case scenario, it is Misdirection and the Argent Squire didn't attack face. VIper could've just played the other Witchwood Imp and win the next turn unless some other shenanigans happen.
That was a huge misplay and cost him the title but I think it's very understandable to brain fart under such immense pressure.