Plenty of players let their head drop when they are stone cold beaten like that. Morris simply pinned the ears back and chased as hard as he could even though 9 times out of 10 it would have been in vain.
Luckily for him Johnson tried to hog the glory and go himself, which slowed him down just enough to give Morris his chance.
Brilliant attitude by Morris to never give up. Great play by Perrett to just go for the man with the ball and not fall for the dummy.... poor play by Johnson to not take the simple route by passing to Tompkins, who'd have had an uninterrupted run to the try line and in all likelihood have scored under the posts.