Having started the season with a flurry of wins, Saints ran aground against Hull KR a week ago, but their attacking display after the interval might have eased a few concerns given the crispness of some of their play.
Feldt’s try came from a smart kick, Sailor backed up his own line-break assist to receive a pass from Harry Robertson to score, and then threaded a perfect kick which Leeds failed to deal with to return the favour.
Whitley also profited from strong running by George Delaney and Jonny Lomax to cross.
Leeds failed to score a single point against Catalans in Perpignan last weekend, and Brad Arthur’s side lacked the fluidity and execution to finish off some excellent situations.
Their two scores came with Saints clear on the scoreboard, and they failed to find the extra gear needed.
