1. Play gurdge match.
2. (can't remember who I was fighting)
3. After grudge match resolves, unknown error (screenshot 1)
4. Accept the error, returns to battle, just sitting there, not frozen (still BG and avatar animations), but stuck on their turn, not moving on. (screenshot 2) NOTICE: I have 25 health, they have 31 health.
5. Close game. Reboot it. Rejoin match. I have 9 health, they have 35 and it's my turn. (Screenshot 3)

Now this next point could be a new bug, but because this all happened after the unkonwn error, I'm including it in this bug report.

1. Put some creatures on the field. Use briarhorn, it gets stuck in the "activated" stage. (screenshot 4)
2. I can target multiple creatures with briarhorn, but it doens't actually do anything, just sits there through every turn (Screenshot 5)
3. Attacking with the creatures that briarhorn is targeting removes the purple target circle, but I can retarget all creatures again, even during opponent's turn (screenshots 6 & 7).

Expected result: No unknown error. And after targeting a creature with Briarhorn, its effect is applied and then goes to the graveyard.