前一阵有人提出一个角色能否在一场争夺中同时作为进攻和防御角色，并如何结算的问题。当时我感觉这应该是不可以的，我特地向FFG询问了下，结论也是不可以。不用纠结了。下面附上邮件原文，理由还是那个“反证法”，如果可以同时进攻和防御，为何不可以反复作为进攻角色呢：
The answer is no. Participation is a binary state, you either are participating or ar not. Without being removed from a challenge it is impossible to participate in a challenge multiple times. For example Greatjon Umber, or a character with a naval enhancement, could not be made to participate as an attacker multiple times adding its STR to that side each time. The same reasoning is applied to it being declared as an attacker and defender, once it has been made to participate once, it can not be made to do so again, on any side, without first being removed from the challenge.
His ability and the rules text for the naval enhancement states "as an attacker or defender" to illustrate the binary state. If it were possible to be both an attacker and defender the ability should be worded differently to either make this explicit.
