There is a possibility that this was lost in translation. Perhaps he said something along the lines of, "I thought Cain's strikes weren't as powerful as I'd imagine." Otherwise if he did say that after the beating it may be a bit tactless.
Either way I know JDS was pissed off. He told Cain, "just like what you said I will be back for my belt," before leaving the Octagon. JDS was battered, but his will was not broken. Cain knows this.
This will be straight up war between the two most dominant HW champs.
PS: Still can't believe he knocked out Mark Hunt.
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.