Solo games above 1000 thophy

I am the only experience that when you play solo games above 1K trophies, that a lot of the e players are not attacking each other but plays toghter to target 1 or 2 randoms togther ?

Just played a game where 5 people ran after me and when they have killed me, they stod still and looked at each other without doing anything.

What’s that about?