Conor McGregor ( 15 - 2 MMA , 3 - 0 UFC ) did what he said was going to do .
It brought about a wild celebration from a deafening crowd at The O2 in Dublin .
Conor McGregor ( 15 - 2 MMA , 3 - 0 UFC ) did what he said was going to do , and it brought about a wild celebration from a deafening crowd at The O2 in Dublin .