Also hes in the enemy faction team and he broke the pick and it also had unbreaking 2. 
Hear me out fellas, if you havethis one guy in minecraft steal your dimaond pick, but then he gives you 4 diamonds, is he bad?
Plawks 30.04.2019
No, he's not bad. He's helping you make another one.
Yui 30.04.2019
Well, if there are different sides and factions, I assume its a PvP server.
So this behaviour is to be expected. Its part of the game, and how these servers operate.
Squidmaster 30.04.2019