Title says it all.
Page 105 wrote:If both characters throw red, things can get messy. Known as a “double without defense,”
both parties attack simultaneously, with neither party defending themselves unless
a defense is built into the maneuver they were using. Resolve both maneuvers simultaneously.
Impact rating (pgXX) does not reduce the opponent’s pool until after both hits have
been resolved. If you have the dice, you can attempt to Preempt the attack (pgXX).
In particular, who has initiative, or do the characters roll dice again?
If no one tries to preempt both attacks happen simultaneously.
If someone tries to preempt the guy who rolled the lowest red is considered the original attacker.
Page 110 wrote:Preempting creates a contested roll, which determines which attack lands first. If dealing with a red/red, the
character who rolled lowest on the die throw is considered the original attacker for steps 1-3 and 6.
I guess when dealing with a red/red where no one tries to preempt, initiative goes to the winner, like preemptive resolution. Also the original attacker should be the one that rolled the lowest red. In case of a tie (MoS0 and equal Reds) I'd resolve it with a coin toss.
Page 110 wrote:If both parties survive, initiative goes to the party that rolled the most successes on their attack roll. Ties favor the original attacker.
However it is not explicitly stated RAW, so I might be wrong.