Despite the DS telling Mark earlier that his lack of aggression was holding him back, the tennis star looked to prove them wrong as he went in all guns blazing against the 'Seen Better Days' singer.
In the most gruesome scene of the episode, Pete was thrown to the ground which resulted in his elbow being dislocated.
“Elbow! Elbow!” Pete said as the stunned recruits watched on in horror.
“Your elbow has come out of joint,” soldier Ant Middleton told him.
Pete was forced to hand in his number and was rushed off the scene by medical staff for treatment.
“Guess what, it happens,” Ant told the visibly upset recruits.
“You’re gonna get cuts and bruises, stitches, breaks. That’s what I said at the beginning, this isn’t a f***ing game. If you don’t like it, give me your numbers, grab your kit and f**k off.”
The reaction on social media was immediate, with one viewer writing on Twitter: "The one time we see Pete Murray and his elbow gets dislocated. OMG."
Others made not-so-subtle references to the crooner's famous hits.
"Pete Murray really has seen better days with that dislocated elbow," one joked.
Another added: "I think we all Feeler Pete Murray’s elbow there."
According to the Byron Bay-based singer, it took three hospital staff and three attempts to put his elbow back into place.
He also admitted he was still unable to straighten his elbow three months on from the incident.
"At the end of my time there I guess the positive thing for me was I hadn’t failed anything; so for me it was a really positive experience."
"I loved the show."
SAS Australia continues Tuesday at 7.30pm on Channel Seven.