Ronin - Between Employers

I have some questions about Ronin - Between Employers.
First, can a player do this once per turn for each Ronin die that is active?
Second, let’s s player one attacks using a character with overcrush. Player two does not block, but instead takes the hit and redirects the damage to a Ronin die. Does the overcrush damage in excess of Ronin’s D value hit player two?
Last question, let’s say player one attacks with two character dice and player two blocks one of those dice with a Ronin die. Player two chooses to redirect the damage from the die that was not blocked to Ronin. If Ronin is KOed by either of the two dice, does the other die then damage player two? Or is the damage being caused by both player one’s dice being caused simultaneously-enough that Ronin just gets hit for all of it at the same time?
Thanks.
First, can a player do this once per turn for each Ronin die that is active?
Second, let’s s player one attacks using a character with overcrush. Player two does not block, but instead takes the hit and redirects the damage to a Ronin die. Does the overcrush damage in excess of Ronin’s D value hit player two?
Last question, let’s say player one attacks with two character dice and player two blocks one of those dice with a Ronin die. Player two chooses to redirect the damage from the die that was not blocked to Ronin. If Ronin is KOed by either of the two dice, does the other die then damage player two? Or is the damage being caused by both player one’s dice being caused simultaneously-enough that Ronin just gets hit for all of it at the same time?
Thanks.