At any time a rare enemy would priorize Thorn Grab over another attack while the target is out of range, it spends a turn on using Thorn Grab, while the game only says "ENEMY uses Thorn Grab...". The worst part about it is though, that it doesn't put Thorn Grab on cooldown after, thus the enemy will try to use Thorn Grab and fail until a more priorized skill would be available to them
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FYI I just ran into a rare honeytree who spent his whole existence on using Thorn Grab in this context, because it was their most priorized attack! Poor thing

Also I played ToME vanilla when I noticed that.