Looking at how people viewed Hashirama's and Madara's relationship on Floydical's topic, I feel that Hashirama has always treated Madara as a true friend rather than his arch enemy, just like Naruto to Sasuke, therefor i don't see that Hashirama had any intention to kill Madara during the battle...but maybe there was an accident and here comes my theory.
Some jutsu went wayward (think Freeza vs Goku!) or maybe when Madara's chakra levels were low, he loses control of Kyuubi and it attacked him. Madara was then left mortally wounded and Hashirama attempts to revive his closest friend by transferring him life energy. This happens to be the formula (as explained by Floydical, +rep to him) to unlocking Rinnegan, Madara unlocks Rinnegan at his death, but it was too late and he dies from his wounds.
What do you guys think of this?
P. S. When exactly Madara actually dies, how his body was taken care of afterwards and how Kabuto manages to find Madara's DNA/body, that's another topic to discuss upon.
Some jutsu went wayward (think Freeza vs Goku!) or maybe when Madara's chakra levels were low, he loses control of Kyuubi and it attacked him. Madara was then left mortally wounded and Hashirama attempts to revive his closest friend by transferring him life energy. This happens to be the formula (as explained by Floydical, +rep to him) to unlocking Rinnegan, Madara unlocks Rinnegan at his death, but it was too late and he dies from his wounds.
What do you guys think of this?
P. S. When exactly Madara actually dies, how his body was taken care of afterwards and how Kabuto manages to find Madara's DNA/body, that's another topic to discuss upon.