Glasgow made it five wins from six to go top of the United Rugby Championship table with a 33-20 bonus-point win over Ulster.
Ulster came from behind to beat the Lions 24-17 at a windswept Kingspan Stadium scoring three tries to the visitors' two in game which was in the balance throughout.
Springbok veteran Duane Vermeulen played his final game for Ulster in the United Rugby Championship (URC) quarter-final defeat to Connacht on Friday.
Springbok veteran Duane Vermeulen is one of 10 players that will leave the United Rugby Championship side Ulster at the end of the season.
Connacht marked Andy Friend's final home game as their director of rugby with a 38-19 bonus-point win over Cardiff at the Sportsground.
The Bulls squandered an eight-point half-time lead on the way to a disappointing 32-20 United Rugby Championship defeat against Ulster in Belfast.