The actor was apparently shooting the climax sequence for the film where his character was supposed to be shot dead. However the blast in the shot was so intense that he had a huge cut along his jaw line that required surgery.
Post the incident on sets, he was admitted to an emergency ward and later shifted to the normal ward. A surgery was carried out later; with a reconstructive plastic surgery carried out to hide the scar.
The sequence in question was apparently a normal blast scene that went haywire as the impact was very powerful, thus hitting the actor in the face, leaving him bleeding. Naturally, the actor and his wife are worried as the wounds require serious attention.