What can you see that went wrong in this video (trail accident)

haven’t read all the post but steep and muddy. I would’ve had it in low and maybe feather brake. Maybe and try and steer out.
I just stay away from steep inclines when it’s muddy like that. For real. I’ve had my share of similar sliding backwards. Glad all is well.
 
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Just catching this thread. To answer the original question, not knowing about the broken brake line, which doomed them from the beginning, engine braking and 4-Lo is a must. It’s the only way I go down steep and/or sketchy terrain. I feel bad for them.