Legion able to hit survivors being unhooked with Feral Frenzy to get free chain

Just played a Legion game with Joey's Mixtape and Defaced Smiley Pin.

Survivor 1 (Kate) and Survivor 2 (Feng) were approaching the hooked Survivor 3 (Jeff). Used Feral Frenzy to damage Kate and Feng on their way to the hook (2 hits). Feng proceeded to unhook Jeff in front of me and I got a heartbeat when the UNHOOKING ANIMATION WAS HAPPENING, so I just went with a hit before he touched the floor, which didn't interrupt Feral Frenzy, but instead it counted as a hit (3 hits). Feng had Borrowed Time. Since Jeff was mid unhook animation, the 3rd hit DID NOT PROC DEEP WOUND, so Jeff still had a heartbeat after being unhooked. Hit him again (4 hits), which activated BT's protection (he got the white-ish aura), but was able to insta-down him again with the 5th hit.

The map was Azarov's Resting Place.

The hook in question was a regular hook

I doubt hitting a survivor while being unhooked is intended to count towards Feral Frenzy stacks.