This video shows him in June of 2015, grabbing his dance partner then jumps off a roof onto the bartender's tent, which resulted in the bartender suffering a broken leg (1st jump off the roof by his opponent Shelly Belly at 2:50; Marvin's jump at 3:35 ).
The lady who suffered the broken leg is the girlfriend of the DJ at the event, and was seeking $1M in damages. Here's a quote from her:
“The surgery cost $805,000, plus the other $100,000 I spent already,” she said. “Marvin [has] been getting pictures! From the incident, we don’t see him. He is aware of the situation, and Marvin not even a call me. He called the Saturday before the surgery, and mommy tell him say, ‘Marvin, her foot broke, and the surgery is $805,000’, but he told her he doesn’t have any money. He said he was gonna get [back] to us and him never get [back] to us.”
And here's what Marvin had to say about it:
"A mi brethren song did a play suh mi a sey mi a give mi brethren a forward. Me and Shelly Belly a go at it, then DJ Boom Boom start instigate a musical battle with me and Shelly Belly and two girls. Anyway, Shelly Belly climb a high place and jump off with the girl he was dancing with and the whole dance start rail up. Suh mi a try outdo Shelly Belly and decide fi climb pon a place with a girl and jump off pan a tent. The whole place tear dung, but a bartender who was under the tent got her leg fracture in the process,"
"The dancer who I jumped off the place with is all right, but the bartender a di one who get a little damage. I checked up on her and she sey she all right, it's just a little fracture leg. Mi nuh want nuh body think mi and Shelly Belly face-off a nothing serious either, a just entertainment,"
(Translation: Marvin blamed the DJ for instigated a musical battle with he and Shelly Belly)