Some people become a little squeamish when they see blood. Others... well, let's just say they don't take it nearly as well. This trope applies to whenever a character becomes incredibly deranged and/or powerful at the sight of their own blood. Perhaps their agility increases, or they become more alert, or they begin to realize their opponent is a serious threat and decide to go all out. In any case, their skills suddenly increase when they realize THEY are the one who's bleeding. Somewhat related to Minor Injury Overreaction. Examples of Blood Upgrade include: