Boars are absolute clowns, I don't care what anyone says - especially when they're together. I never saw my two do that precisely, but they did used to rumble at each other, mount each other, fall off immediately, and then chase each other in a zoomies circuit they made up on the spot. Lots of excited shrieking going on at the same time too, it wasn't like a squabble or an argument.
Then there was the days they "shared" a lettuce leaf between. them. Blitzen would steal it off Comet and get a mouthful. Comet would then steal it off Blitzen and get a mouthful. Rinse and repeat til there's no more lettuce leaf - but they'd still be convinced the other one was just hiding it somewhere. "You hid my lettuce." "You hid MY lettuce!".
Ah, boars.