Watford drop into the bottom three as a ninth consecutive sport with out a win piled the stress on supervisor Claudio Ranieri.
Sargent had no longer scored a league purpose considering that his August move from Werder Bremen, however got here exact at a important time for the Canaries bid to overcome the drop.
"To get your first one and then your second after that turned into pretty crazy," stated Sargent. "It's a huge recreation for us so a tremendous night time standard".
"Every sport is big for us, however to get a win against the crew proper in front people is a big win."
The American's audacious flick with the outside of his boot crept in off the bottom of the bar to open the scoring six mins into the second one half.
Play was then held up because of a floodlight failure, however it was the site visitors who sparkled while the sport resumed.
Sargent's towering soar to meet Milot Rashica's move doubled Norwich's lead.
Watford had been then dealt every other big blow while pinnacle scorer Emmanuel Dennis was despatched-off for a second bookable offence.
The Nigerian were lucky to escape a straight crimson while choosing up his first yellow card for a excessive project on Pierre Lees-Melou and will haven't any proceedings after any other mistimed lunge on Max Aarons.
Dennis will pass over every other huge clash inside the war to conquer the drop in opposition to Burnley on February five.
