Mcrimmom doesn't notify players until the trade is complete.
Fleury finds out about this trade beforehand, he gets Alan Walsh to do anything to make this trade fall through.
And Fleury knew of Chicagos interest in him. So lets not act like he was completely blindsided here.
As to whether or not the Knights should have traded him? I don't know.
As to whether or not the Knights should have notified him beforehand of the trade? I don't think so.
If Fleury learned of the trade from social media, that is a poor look for Vegas.