at this point, it's pretty hard to tell exactly what happened, but i'd say 90% of the bikes that come into my shop looking like that got that way because the hanger was bent and the rider didn't realise it and shifted into the spokes. check the drive-side spokes for any gouges. if you're going slow enough, you won't actually get any cut spokes, it'll just go "clunk clunk clunk" until the inner pulley cage bends enough to get caught on a spoke, and then around she goes.

you can sort of see where the pulley cage might've gotten caught. the cage near the top pulley is bent waaay inward. that's probably where it hooked into the spokes.

or, the low limit screw was misadjusted and the chain went behind the cassette, which would explain the "vrrrrrrr" sound. that would've sucked up enough chain to pull the RD into the spokes as well. you should check the spokes behind the cassette for gouges. any damaged spokes will need to be replaced.