Breach - Timer expired but I was able to beat Xesht

Hello, just to report that I was able to fight Xesht T4 after the timer expired.

I don't know if it has anything to do with it, but I play on Xbox and this was my first time fighting him in T4.

The timer expired at about 70% of the way through, something like that. Nothing changed, there were still mobs and the path continued until the boss.