It's edited
(1)the movement in jousting is a force more around the lumbar area not the head.
(2)If you view it one frame at a time they hit each other in one frame wich is impossible with out causing a breakage even with no decap.
You're so weak you're like Kool-aid without sugar.
That movement could only happen within several frames, they can't just jump like that, unless you edit it so that the neck changes position in one single frame. ;)