William Chan admitted that he tore a muscle hefting co-star Hu Jun over his shoulder on set.
According to William, he had underestimated Hu's weight, and when he pulled him up, he caused one of his muscle to tear.
He mentioned the injury during a visit to the Beijing Fire Department for preparatory training for AS THE LIGHT GOES OUT (GAU FOR YING HUNG).
The training was no different from real firefights according to William.
Later he dined, trained and followed firefighting rules together with the professionals.
At the end of the event, he praised firefighters as real heroes.
In comparison to what real firefighters go through however, William admitted that his injury was nothing.