He did that in their first meeting, it's just unfortunate that he got exhausted easy and that's the reason why he lose power. Despite of that, he was able to survive but unable to win the fight for the obvious reason. Maybe he needs to play smarter this time, be more technical than just going all out war.
This is most of the time the torn for the power puncher out there when they face an opponent where who can actually take some punches from them and no matter how much they throw, it seems like nothing and they lose their focus when that happens. this is where most of them taste they're first lost and will gonna get matured or they will gonna acquired some new skills when they step back in the ring. This is an interesting fight because we will gonna see if he really improved or not.