I know you got the point already from a lot of people already, but i wanna try to clear the air here.
You may have watched Physicx at Hip Hop Planet where when it was Rivers(Physicx) vs Meme Pas Mal(Junior)
Physicx was on a roll in this event, Physicx did some moves including the hollowback but more importantly he pulled off one of his famous moves of (i dont know what it's called but the thing where it's a handstand and his legs rotate around his waist, same thing that Junior does) after he finished doing that move he start pointing at himself a lot walking towards Junior getting in face saying "this is my move" basically (this was during the tie-breaker)
Also after Physicx was struggling with a freeze after his elbow spin Junior started making some hand gestures then Physicx immediately went over to him and started Uprocking.
He also probably did a lot of the moves junior does so Junior couldnt really use them after because he would look like a biter (strategic). The match led to a tie-breaker, when it started Physicx started off by slowly walking around Junior staring him down, when Junior was doin footwork Physicx was kneeling down to his level watching giving dissapointing looks then Junior lightly slapped Physicx's face. Physicx stood up and pretended to kick Junior in the head but didnt. Of course in the end they shake hands blah blah blah
If you watched Physicx vs Junior in that big stadium place they were very respectful in the beginning, only things that happened here were minor. What basically happened was that Junior did hollowbacks the whole match and Physicx did a lot of other moves. Also during the match it looked as if Junior was finished dancing and Physicx wasnt sure if it was his turn so he stepped forward then Junior pushed him back but it wasnt a big deal. Near the end of the match Physicx already looked like he won so he started doing some uprock in Junior's face.
You could see there was some tension between them too at Bboy Unit 8
During Physicx's turn Junior hopped off staged onto his hands trying to steal his thunder. and when Physicx messed up on his Airbaby to Freeze Junior did a one-armed-handstand thing and Physicx ran over putting his finger up to his face until he stopped.
Sorry for all the words lol
They kind of have a bit of history i wouldnt say they're enemy's but not friends either.