At the moment when the United manager probably assumed the team's momentum wasn't changing, his side delivered Oliver Glasner's team's first home defeat in league competition from February onward.
The Austrian coach's players started strongly justifiably opened the scoring via Jean-Philippe Mateta's repeated spot-kick. But they could not to make their dominance count after previously struggling to find the net at Selhurst, Amorim's team countered with a rapid double from Joshua Zirkzee and the English midfielder.
It was a frustrating day concluding of a long week for the Palace boss, who saw Ismaïla Sarr leave injured with a worrying issue prior to the break.
Ruben Amorim likely maintained his reactions subdued while walking toward the dressing room right after the match's conclusion.
The United manager minimized parallels involving the two coaches' tactical approach in the buildup, though recognizing that Palace "currently execute things better than us|aspects superior to ours|elements more effectively".
The answer to the lacklustre defeat versus reduced Everton involved altering both wing-backs, including the young winger shifting to the right side as Diogo Dalot replaced Patrick Dorgu.
The visitors likely felt a opening to capitalize considering they enjoyed extra rest days and came close to leading within the first minute.
A lengthy throw-in generated disorder in the Palace area yet remarkably Dean Henderson executed a reflex block near the net to deny Casemiro.
The narrow escape served as a wake-up call for the home team post the lunchtime beginning which was determined for broadcast purposes.
Quickly opportunities began to come in quick succession. After missing a hatful of chances in midweek, it seemed like could potentially not become Mateta's day as he pulled efforts missing the goal in the initial phase.
Yet amid days when talks over Mateta's contract extension faced delays, Mateta stepped up who found the breakthrough.
One more perfect ball by the midfielder drew the defender into the challenge after recently producing superb interception to prevent the Spaniard, the 20-year-old could only bring down Mateta in the penalty box.
Henderson re-emerged with head protection to shield his eyes from the setting sun but he will be disappointed to have allowed United to equalise eight minutes following halftime.
Glasner's team was unprepared via a fast United dead ball and Zirkzee was able to chest the ball down while turning simultaneously to generate a strike that found the top corner.
Following weathering a frantic moment when the Dutchman nearly netted another time defensively, their afternoon got even better a few minutes later as the Dutch attacker was fouled outside the penalty area by the English center-back.
A temporary uncertainty developed in the defensive wall during Fernandes' delivery the free-kick to Mount permitting Mount to beat Henderson using a fierce strike.
Missing the Senegal international's acceleration to utilize, Palace could barely muster further attempts as United were able to secure vital three points that means the Red Devils climb above Palace up to sixth spot.
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