I thought from the bang from their boobs colliding and then getting kicked afterwards in the boob that maybe the other woman had some kind of protective armour or something... maybe not.
I do have one criticism of this series, and it's the fact that Nighthawk having been out of the game for years and gotten considerably fatter doesn't seem to matter. She's running up walls and doing flips. Does her physical condition just never deteriorate? Plus she smokes! Idk, straining my suspension of disbelief.
Also I agree the translator's gag that "Nighthawk, Once Again" is a dumb name. "Nighthawk Returns" is far better.