Jason is heading for heartbreak later this month as his girlfriend Maria Connor (Samia Ghadie) breaks up with him, but his sadness turns to fury when he discovers that Marcus is the reason for their split.
Marcus has always identified himself as a gay man, but has fallen for Maria and decides to make a go of things with her in upcoming episodes. His ex Sean Tully (Antony Cotton) is first to discover what is going on between the pair, and quickly spreads the word to Jason at the Rovers Return.
Thomas told TV Times of Jason's reaction: "He does more than punch [Marcus], he goes a bit wild!
"It's funny because in the script it was just supposed to be a punch across the table, but then a fight co-ordinator came over and said, 'I want you to punch him across the table, drag him against the bar, slam him into the bar, he then drops to the floor, then you kick him, pick him up and smash his head on the bar'. So it was a big fight!
"I actually kicked Charlie in the head - I didn't mean to, I love him very much, but in the moment it was just one of those things that happened."
Meanwhile, Condou added: "I was slightly concussed! I had to go off set for 20 minutes. Ryan was mortified - he kept phoning me the next day to check I was alright.
"It's always difficult when you do those things but because Ryan and I are close friends, it makes it even harder. Although I think maybe he enjoyed it!"
Coronation Street airs the bust-up on Monday, November 12.