The Speak No Evil actor had not interacted with the man previously, nor did he provoke the attack, which occurred around 11:55 p.m. Other patrons of Charlotte's Room rushed in to restrain the man, who was eventually escorted out.

EW has reached out to Charlotte's Room for comment.

California Schemin' is McAvoy's first turn in the director's chair, though he previously produced the 2013 Jon S. Baird film Filth, which he also starred in.

The 46-year-old Scottish star also appears in California Schemin', which he described to PEOPLE as "the most creative thing I've ever done." The film tells the true story of two young men who journey from Scotland to America to test their mettle in the cutthroat world of hip-hop. Joining McAvoy in the cast are Séamus McLean Ross, Samuel Bottomley, Lucy Halliday, and Rebekah Murrell.

"Look, I probably fell into all the same traps as every director that I've gone like, 'Dude, what are you doing? Just direct me right.' There is no 'right,'" he continued. "I thought I would have a shorthand with actors after 30 years, and I did to an extent."

This year's edition of the Canadian film festival, long considered a launching pad for the following year's Best Picture race at the Oscars, also throws a spotlight on the directorial debut of another A-list actor: Scarlett Johansson. The Black Widow star's Eleanor The Great, which stars 95-year-old June Squibb, premiered at the Cannes Film Festival back in May, but competes for the coveted TIFF People's Choice Award this year against California Schemin'.

With reporting by Gerrad Hall.