"When attacking with your primary weapon, the defender must spend one focus token if able.
When defending, the attacker must spend one focus token if able"
Initially I did not read this carefully and responded to what I believed was the intent of the card: if you have a focus you have to spend it at some point during the attack or defense to satisfy the card. But read again: must spend if able.
If you're kanan, you are able to spend during the second step to reduce the attacker's dice pool. Therefore you must spend. Which you'd want to do anyway, so that's fine.
But say you roll your attack against the hot cop. You get a hit, an eyeball, and a blank. So you want to use your target lock and then spend the focus. Except having rolled the dice you meet the only criteria that the card lays out: you are now able to spend a focus token. Therefore you must spend the focus token. Only then can you reroll.
Because there's no timing window provided. You don't get to pick the order to resolve simultaneous effects because there are no simultaneous effects. There is only a requirement: must spend, if able. You are able to spend prior to rerolling. Therefore you must. It's an if-then, and you meet the if as soon as you roll.
Right? if not, why not?