While were still in the match making screen. It put him into a game with out us . Then the game keep trying to match make the teams, While he was still in the party, It did not remove him from the party or anything , but allowed him in the game with out us, so he was in a different 5 person game, while were out side in the match making screen still looking for a match.
It was still showing he was in the party and all.
Fyi on the PS4 version.