There is a known issue relating to Angel of Fear countering which can cause a soft lock... while I don't think we had a direct fix for that in the hot fix update, the chance of that should be reduced (or maaaybe eliminated; we haven't rechecked that specific scenario that caused a lock before after we did the hot fix adjustment for counter/revenge triggers).
Yup, that's what it's for. I'll post new patch notes as it's going live, but there's not too many changes, so I'll keep this thread as the update discussion thread.