Definitely. According to the timeline I saw online, from the time of the first shot to the would be assassin on the roof being taken out, was 26 seconds.
Firing a shot every two seconds is not difficult. It is a little harder if you have to shift targets.
Well trained and practiced experts could get off 48 rounds in a minute, aiming at a target 200 meters away, with a bolt action Lee-Enfield .303 rifle.
” ... with a bolt action Lee-Enfield .303 rifle.”
With a SIG Sauer 200 STR target rifle.