This was during the dirty bomb stream that happened today 
The round should end when all attackers are finished and the last attacker is downed, however there is an implementation in which if the last alive is a phoenix and get’s downed, the round wont end (since he can self-revive)
However, what happened this time is that a Nader got downed (2nd to last) and last alive was a phoenix. When the phoenix got downed he was later finished but the round still continued as Nader was still down but not finished (without any ability of getting up, unless maybe martyrdom?)
Then when Nader eventually matyrdom’d the round still continued even though the entire attacking team was down and finished (the bomb wasnt even planted either!) so the defenders just had to wait a few minutes just running around waiting for time to run out
