I like this idea a bunch, I just think they couldn't be too strong as to not coerce players to build melee every time they pick those characters. That said, every ounce of uniqueness they sprinkle into the kits the better and these paired with the animations they seem to be going for would be so...
Adding to this, I just got the same bug in my match: 35292048
It was also the movement buff on just one side of the map. afaik I was the only one seeing it. I didn't see the other team try to hit it and I asked my party if they saw it and they said they could not.
I think balancing around multiple playstyles is definitely the right choice and I love the idea of a holiday hitting a standoff "fan the hammer" against another player/team.