It took just six minutes for Watford to hit the front as in-form captain Imran Louza played a beautiful pass over the top from deep to Bola, who expertly controlled it in his stride before slipping the ball past City keeper Radek Vitek for his first goal for the club since joining from Turkish side Samsunspor.
The hosts were in control at that stage and could have doubled their advantage but Vitek did well to keep out Edo Kayembe’s strike from distance which was cleverly touched towards goal by team-mate Kevin Keben.
That save proved to be pivotal as, soon after, Twine equalised with a whipped free-kick from the left which Selvik could only palm into his own net.
That goal changed the momentum of the game with the visitors dominating the ball but Watford had an opportunity to regain the lead before the break as another Kayembe strike was gathered in by Vitek.
Ten minutes into the second period, Bristol City’s Anis Mehmeti received the ball 20 yards out and arrowed an accurate left-foot shot towards the bottom corner but it was smartly tipped around the post by Selvik.
Down at the other end, Bola had a chance to claim his second of the night after Nestory Irankunda did well to get around the back of the City defence but he scuffed his effort wide of the mark.
Twine then found himself in acres of space and put Sinclair Armstrong clear with an inch-perfect through ball but the Bristol City striker was unable to beat Selvik who came out to meet him to make a good one-on-one block.
A Watford corner from the left then found itself all the way to Othmane Maamma at the back post and the Moroccan substitute forced Vitek into a save before the on-loan Manchester United goalkeeper kept out further efforts from Luca Kjerrumgaard and Kwadwo Baah.
Substitute Baah stung the gloves of Vitek late on as Watford racked up 10 shots on target, while fellow replacement Tom Ince’s instinctive strike was parried out by the visiting stopper as the hosts had to settle for a point.
