Even modern hyenas are formidable and I would not want to be surrounded by a pack of them. They regularly duel with lions.
https://alumni.duke.edu/sites/default/files/dm-main-images/p...
https://pbs.twimg.com/media/ETcFOq3UcAEjG8Y?format=png&name=...
A modern hyena could trivially kill a human all by itself (hyenas have literally bone crushing jaws), which doesn’t even consider a pack of them.
I actually found this video where a hyena basically took what it wanted from a leopard before the leopard took its prey up a tree. (Warning: predators with dead prey.)
The two animals were surprisingly "civil" given the amount of damage they could have inflicted on each other...