As the two stood toe-to-toe for a photo-op, Jones touched foreheads with Cormier who didn't like that too much. He responded by shoving Jones.
"Bones" then charged with a punch and the pair toppled off the stage.
It took several security and staff members to pull the two apart but eventually order was restored and no one was injured.
The fight can be seen on pay-per-view on September 27.
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