There is this perception that Sweeper monk did not use any form of protection whatsoever when he let XF whack him in the chest, right after he KO'ed XF's dad.
It is said that if he did, XF would have bounced off right away. Indeed XF would have bounced off if he used his energy shield like he did against MRF.
But, lets just state some facts and then rethink again.
1) Sweeper has awesome energy
2) Sweeper does not have adamantium skeleton
3) Sweeper = old man
4) Sweeper without his energy = random old man on the street.
5) XF hits a high level fighter (using energy to protect himself) on the chest with Dragon palms = injury
6) XF hits high level fighter (not using energy) on the chest with Dragon palms = near death
7) XF hits random old man on the street = instant fatality
Therefore, XF hits Sweeper (not using energy) = near death.
It is impossible for him not to have done anything at all to defend against XF's blow. I'm assuming he did use some of his energy to protect his internal organs and meridians at least to avoid some critical injury.