I don't even question the decision to retreat into his own end. In NHL regular season overtime, that's a common strategy. You just can't lose the puck there. You can't. He turned it over and got torched, end of.
I also can't fault the other guys for not covering afterward. They were on offense; their goal is to get as much space between them and the opponents as possible. Once the puck turns over, there's no time to recover. Perhaps they could have done a better job of giving Zach an out before the turnover, but at some point you have to trust a teammate to not get beaten on a simple play.