I think that he tripped. People have said multiple times that he's clumsy and I have seen other live concerts that he's tripped. In the video it looks like when he was about to land after the spin, he's foot slipped from under him. Ikon works just as hard as any other idol group. It doesn't make sense why they would throw away all that hard work to make a joke. I feel like people are accusing them because first they are wearing girls clothing and wigs, and second because Jinhwan tripped after the incident with G-Friend. They have been through enough bad mouthing and false accusations. They worked hard to get where they're at today.