Bennett is beaten as he attempts to pull Faisal before he makes connection with the shot a few balls later for a four.
He inside edges the next ball which goes fine on the leg side for another boundary as Zimbabwe race to 30 for no loss in three overs.
Sufyan Mehmood gets Oman back into the contest with a double strike in his first over.
He strikes first ball with the wicket of Marumani, who is caught at point with Wasim Ali taking a superb diving catch.
Marumani stroked a quickfire 21 from 11 balls to give Zimbabwe a flying start.
Two balls later, Dion Myers is given out on the review after he got an inside edge as wicketkeeper Vinayak Shukla standing up to the medium pacer completed a sharp catch.
The experienced Brendan Taylor punches the last ball straight for a single for the only run of the over.