He looked like he was treating that animal with contempt. Looking at it, there was no doubt in my mind that lion had a grudge and dislike for that guy, and when it saw the chance...it took it.
The guy looked like a foolhardy ass turning as he did, in my opinion.
The trainer had 10 years of experience, was not some novice making mistakes. The lion was apparently recently captured in the wild and apparently not sufficiently tamed and trained.
Very sad, but I don’t want to blame the trainer.