If Arcane Feedback kills the hero holding the card, the game freezes. Attached card won't activate, and the new hand isn't dealt for the next round. However, I can still inspect cards, and the clock still ticks.
Got a room number? If not, and you were doing single-player, can you say what battle it was? We've seen a number of trigger-on-death issues, so first I'd want to be sure that it's not actually the fault of, say, Festering Guts/Superstitious/Mindless Battlerage before accusing Arcane Feedback. But I've never died due to Arcane Feedback before, so I know it could indeed be the problem.
I've had my Wizardess die(and freeze the game) 3 times to Arcane feedback, and all 3 times she was in either the first or second battle of Dungeon of the Lizard Priest(level 4 adventure). The source of the card is Untrained Electromancy(Level 3 Uncommon Arcane Skill). I only got my beta key about a week ago, so I don't recognize those cards you linked at all.
She died again(on purpose this time) to Arcane Feedback and froze the game. This time in the third battle of Dungeon of the Lizard Priest. I figured out how to get to the developer console and found this EDIT:Cirrimeer is my Wizardess. At the time she was only holding Arcane Feedback and Dash There were 3 other characters in the room. My Human Warrior HP 13/17 holding Shifty Stab and Run. My Dwarven Priest HP 17/17 holding 2 rusty armors(one was revealed to Gary). A Lizardman Netter HP 1/15 Holding 2 cards, one was run. Nobody had any cards attached to them. Please let me know if you need any other information.
Then that's pretty definitively the fault of Arcane Feedback. Ew. Never knew a crash was lurking in the code.
It is a beta after all. A crash somewhere in the code is inevitable. Anyway, glad I could help track it down.