Previous seasons there was always a small upstanding edge on the bridge @ blade's edge. Which can prevent people from falling off. I ofcourse do not know the situation you guys were in.
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If he had AMS up theres a good chance he didn't take the knockback since its a magic effect.
Honestly your healer is holding you back. I faced you once with a normal team we opened on a shaman, No fearbomb no lifegrip just a pain sub we burnt through