I would like an opinion from, say, David Attenborough or equivalent expert on gorillas. La Vallee des Singes, near where I lived had gorillas roaming freely without demonstrating aggression towards humans ( a shallow, narrowish moat was all there was between us). I can't see any signs of that gorilla behaving aggressively, poor animal - he may even have been trying to care for an infant.
Agree with gness about mother's behaviour and think it is all very strange. Would, as I say, like an expert's opinion. At the moment, my sympathies lean towards the gorilla.