BlueTracker

The crazy Combat animation speed-ups and skipping animations/attacks is a bug, we're looking into it. Sorry about that.:(

(The faster minion drop animations in Recruit are here to stay though, go Deryl go!:))

Edit: Clarification on what's causing this from syah_hs:

There are a lot of different mobile devices out there and Hearthstone doesn't run the same way on all of them. In Battlegrounds, some players experience a lag in how animations are processed. This can become very pronounced on mobile in some cases.

At launch we had some issues where this lag could cause you to get back to the shopping phase so slowly that you could even miss your entire turn. We wanted to make sure that even if your device was running slower than expected, we still get you back to the shop on time.

This tech is only active on mobile. It tracks whether you're running behind and it will skip attack animations until you're caught up. It does make it much harder to follow, but at least you should be getting back to the shop on time.