Say an HF agent crashed on spherus magna and he sent a distress to HQ and they fought or something like that?
Then I'd guess its time to crush some cores.
It would be hilarious but sad if the ending to bionicle was during the fight between Mata-Nui and Teridax if the hero's came in to save the day
They would think the wildlife is hostile lol
I ranted on this topic a while back -- I believe my consensus was that, if the fans wanted HF and BIONICLE to be in the same universe, which plenty of them do, then they are.
Welp, they'd just die.