That's alll because Vegeta was exausted. He is unable of fighting at full, like someone would in real life.rereboy wrote:Because Ki/energy is a combination of mind, spirit and body. If one´s body is (being) injuried, the ki/energy suffers and decreases.
Nail`s regeneration cost him energy just like punching or shooting a ki blast cost energy. The only thing different is the amount of energy. The energy spent might be minimal and not even noticiable (on a scouter or otherwise) or it might be a huge drain of energy and be very noticiable (and everything in between). And to Nail, regenerating an arm, costs a significant amount of energy.
As for someone being all injured and at the end of his ki and still be able to concentrate enough for a punch at full strength, that doesn`t make sense.
Just look at the battle with Vegeta. Why do you think that Gohan was able to fight with him before turning Oozaru? Why do you think Yajirobe survived his multiple punches and attacks? Why do you think that when Vegeta tried to blow them all after being hit with the Genki Dama, he was unable to do so and everyone survived?
Because he was injured, he was tired, he had lost a ton of energy and as a result his battle power decrease dramatically and even Gohan was able to fight him, and Yajirobe was able to survive his punches. If he could attack at his full power (18.000), even for a second, at those moments, he would destroy Gohan (who had a maximum of 2.500 when Piccolo was killed and he used all his rage) and Yajirobe (who was even weaker).
But that's something different from saying that he has a lower battle power, even if it has some similar effects.




