Sir Ian – who plays John Falstaff – was circling a battle scene involving the Prince of Wales and Henry Percy, when he fell off the front of the stage. As the house lights came up, the actor cried out in pain and staff rushed to help.
One member of the audience told the the incident was “very shocking”.
“I really hope that he is going to be alright,” Sandro Trapani said.
“As far as I saw, he was conscious because he was asking for assistance.”
