Actor Enchong Dee lost hold of Kim Chiu in a dance number earlier in ASAP 2012. The two were paired together and a bad lift by Enchong led to Kim falling on stage, hitting the floor.
Enchong could have lost his balance while lifting Kim after an amazing tumbling stunt of the two. At any rate, minor accidents like that is not new in a live production. What's more important is that they have regained their morale and continue to amaze everyone with the dance, finishing on a higher note.
Watch Enchong and Kim's minor accident video at ASAP 2012: