Yes, there is notning weird about this at all. But Vergo did not need to trick him. This was a complete troll move and playing around on his part. Vergo used his ankle and Judge's son checked up high on his shin, so really it shold've been Vergo who should've broken his ankle. That's enough cause to say Vergo was just messing with Judge's son. He is simply leagues above and for him this was just some good all fun. Judge's son was a bug to him. Vergo was the arc villain that proved the boast and accolodates of Doffy and Caesar when he could joke around with Judge's son. It also sets him up as a funny character, quite unlike how the community perceives him