Re-reading the part about Mickey saying oversould don't cast shadows.
I read about mickey saying Ren has a weak heart because he went aganist the will of the family and swore his heard will be clouded again? (or did i interpret it wrong?)
Here are some helpful images for those who may have forgotten.
EDIT: crap! i even forgot to put da question! Here it is-
How does Ren have a weak-willed heart? He freaking kept going at mickey after alotta blood loss.