This was the second time he was hurt at the end of the 8th. Caught with a counter/exchange on the chin
In all honesty fam, I think you're overselling him being hurt. Spence still looked composed and had his whereabouts, even punched back. Spence just looked like he got rocked a lil and he had to gather himself back real quick and that was that. The punch snapped his head back a lil, but it really wasn't a hard concussive shot like that. He clinched and wrestled a lil cuz thats what you do when you a lil buzzed. That's regular boxing type shyt to me. He wasn't even hurt enough for Brook to manhandle him in the clinch so that kinda shows you the extent of that punch's power.
Hurt is like Cotto hanging on to Chop Chop for dear life.
Hurt is Thurman damn near getting bodied by Lopez in the 7th.
If punch effectiveness was a scale of 1 through 10 with 10 being 2 of the above examples.....Spence got hit with something that was like a 6. Decent shot that if you catch it wrong, might buzz you, but if you have a chin and some smarts you can recover from it quickly.
That's how it looked to me though. We all see things differently.