And if he'd got himself knocked out in an exchange, he would've been slaughtered by fans and pundits alike.
Joshua gave up, what? around 50lbs last night? It would be foolhardy in the extreme for him to try and plant his feet and try and generate power, even more so knowing from the first fight that this guy can take his best punches at a heavier weight and power differential.
The post-fight notion of Ruiz not being a threat belies the truth.
He should've gone for an early KO. That would've sent a proper message that the first result was a one off. He's already demonstrated he can knock him down, so this time knock him out.