Precisely as the United manager likely believed his luck would never turn, the Red Devils managed to inflict Crystal Palace's initial home loss in league competition from February onward.
The Austrian coach's team dominated early and deservedly took the lead through their forward's second penalty attempt. But they could not to capitalize on their control after previously struggling to find the net at Selhurst, the visitors responded with a rapid double through their summer signing and Mason Mount.
This represented a difficult afternoon at the end following a busy period for the home manager, who observed Ismaïla Sarr leave injured with a serious problem prior to the break.
His Portuguese counterpart may have kept his feelings controlled when proceeding down the tunnel right after the final whistle.
Amorim had played down comparisons between his and Glasner's tactical approach during preparation, though recognizing that the opposition "are just doing things better than us|aspects superior to ours|elements more effectively".
His response to the disappointing loss versus reduced Everton was to change the wide defenders, with Amad Diallo moving to the right flank while the Portuguese replaced Patrick Dorgu.
The visitors likely felt an opportunity to profit given that they had three more days to prepare and nearly scored first within the first minute.
A lengthy throw-in generated disorder in the Palace area however incredibly Dean Henderson made a close-range stop on his goalline to prevent the midfielder.
The near miss served as a wake-up call for Palace following the midday start that was dictated by TV requirements.
Rapidly attempts began to come in quick succession. Following wasted numerous attempts in midweek, it seemed like perhaps it wouldn't be the striker's opportunity after he sent efforts missing the goal in the initial phase.
But in a week when talks over the forward's renewal have stalled, the French striker emerged who opened the scoring.
One more perfect ball from the England international lured Leny Yoro into the challenge following an earlier excellent defensive stop to stop the winger, the 20-year-old was forced to foul his compatriot inside the area.
Henderson re-emerged in a baseball cap to shield his eyes from the setting sun yet he'll feel regret enabling Amorim's team to draw equal following halftime.
Palace were caught napping via a fast United dead ball allowing the forward to control with his chest and swivel in the same movement to unleash an attempt that sailed into the far corner.
After enduring a goalmouth scramble where Zirkzee almost scored once more in his own net, their afternoon got even better shortly afterward as the Dutch attacker was tripped on the edge of Palace's box by Marc Guéhi.
There was a moment's hesitation among the defenders as the captain passed the set-piece toward Mount permitting Mount to beat Henderson with a powerful drive.
Lacking the winger's speed to depend on, Palace could barely muster additional opportunities while the visitors managed to complete a crucial victory elevating Manchester United leapfrog the Eagles to sixth position.
Award-winning journalist with over a decade of experience covering international media and technology, known for insightful reporting and data-driven analysis.