Though it was somewhat surprising for Tomoe Mami to take the initiative, upon reflection, it wasn't really unexpected.
From Duanmu Huai's understanding of Tomoe Mami, her core element is simple — she fears death.
Originally, Tomoe Mami became a Magic Girl by signing a contract with QB because she didn't want to die.
So naturally, she hopes to stay alive, and of course, she would be unwilling to accept the fate where Magic Girls eventually turn into witches.
This is similar to a cancer patient's predicament: continuing with current chemotherapy will inevitably lead to death. However, trying a new treatment might offer a 50-50 chance of recovery or deterioration — at least it's better than the present situation, where the outcome is certain.
By using the new method, at least there's a 50% chance she wouldn't become a witch. From 0 to 50, that's a huge 50% increase!
For others, they might consider all angles, but for Tomoe Mami, who longs to survive, this is her only choice.
