Jeanne's self-consciousness only caught up after she raised her hand to shoot off Asgard's foot.
She had just used the only armor-piercing bullet inside her glove. Ordinary bullets can't cut through soft yet tough magnetic chain weapons; armor-piercing bullets can, but there's only one, and it's cumbersome to reload. Even if a magnetic chain weapon gets severed, it doesn't affect its use. Moreover, the master controlled a weapon clearly exceeding five strands, so Jeanne had been hiding this shot since earlier.
At the moment when she realized Asgard was in danger, even before her self-consciousness could calculate the merits and demerits, Jeanne had already acted, severing Asgard's foot.
The impact of the bullet sent Asgard rolling to the ground and then bounced up. Asgard quickly used magnetism to stabilize himself.
Jeanne rushed over and pulled Asgard up.
But Asgard said, "Don't worry about me, I can't walk anymore. You go, I'll clear the way!"
