I just got Terrorbeast from a sacred shard, and I hear that he is good at fire knight because his A2 does reflect damage for 3 turns.

Problem is, whenever I use Terrorbeast A2 on the fire knight, the game freezes and I get an error box. Then it glitches me out of the battle and back to the bastion. 

I can use Terrorbeast A2 in the campaign, but it freezes the game when I use it in dungeons.

Please help, I worked/gamed hard for that Sacred Shard so I would like to be able to use my epic without the game freezing.

Note-- this isn't just my slow wifi. On computer and iOs, as well as on a completetly different wiFi my game still freezes.