Precisely as the Portuguese coach probably assumed his luck would never turn, Manchester United managed to inflict Crystal Palace's initial home loss in the Premier League since February.
Oliver Glasner's side had been rampant and deservedly took the lead through their forward's repeated spot-kick. But they could not to make their dominance count after previously struggling to score against Palace, Amorim's team countered two times in quick succession from the Dutch forward and the English midfielder.
This represented a difficult afternoon at the end of a long week for the Palace boss, who saw Ismaïla Sarr depart hurt with a worrying issue in the first period.
Ruben Amorim likely maintained his reactions subdued when proceeding toward the dressing room immediately after the game's end.
The United manager minimized comparisons between the two coaches' tactical approach in the buildup, though recognizing that Palace "simply perform things better than us|aspects superior to ours|elements more effectively".
The reaction following the lacklustre defeat facing ten Toffees was to change the flank players, with Amad Diallo occupying the right wing as Diogo Dalot replaced Patrick Dorgu.
United must have sensed a chance to benefit since they possessed three more days to prepare and nearly scored first inside the opening minute.
An extended delivery created confusion in the home penalty box yet remarkably Dean Henderson produced a point-blank save near the net to prevent the midfielder.
The narrow escape functioned as a warning for Palace following the midday start that was dictated for broadcast purposes.
Rapidly attempts began to come frequently. Following wasted numerous attempts in midweek, it looked perhaps it wouldn't be the Frenchman's match when he twice dragged attempts off target during the first quarter.
However during a period during discussions about Mateta's contract extension faced delays, the French striker emerged who opened the scoring.
A further accurate delivery from the England international lured Leny Yoro into making contact and, having just made superb interception to prevent the Spaniard, the 20-year-old could only bring down Mateta within the 18-yard area.
Henderson re-emerged with head protection to shield his eyes from the setting sun yet he'll feel regret to have allowed United to draw equal after the restart.
The home side was sleeping by a quick Bruno Fernandes free-kick enabling the Dutchman to control with his chest and pivot in one motion to produce a shot that sailed into the far corner.
Following weathering a frantic moment when the Dutchman nearly netted another time defensively, their day improved further shortly afterward while Zirkzee was tripped near the 18-yard line by the English center-back.
A temporary uncertainty developed in the defensive wall as the captain passed the free-kick to Mount enabling the Englishman to beat Henderson using a fierce strike.
Without Sarr's pace to call on, Palace could barely muster further attempts allowing Amorim's team to secure vital three points that means United move above Palace up to sixth spot.