The sight of West Ham fans streaming out of the London Stadium before half-time said it all.
With Arsenal having propelled themselves into a 4-0 lead by half-time, a significant number of Hammers supporters had seen enough.
Those who did remain to the bitter end failed to see a positive reaction, with Arsenal scoring two more second-half goals to secure their biggest Premier League away victory and West Ham's biggest home defeat since 1963.
The result will increase the pressure on manager David Moyes, whose future is uncertain as he enters the final five months of his contract.