"QUATERMAN's bullets cannot be modified except by attached goods. Cards cannot move or boot QUATERMAN."
"If your posse has a higher total bullet rating than the opposing posse, boot your shooter to increase your hand rank by two."
I think that me, as the player, can boot QUATERMAN to pay the cost of Outgunned. My logic is that since Outgunned is not doing the booting, it means that QUATERMAN's restriction doesn't apply.
Is my interpretation correct?