Incapacitated is a strong word. A broken character is "put out of action" but it can differ slightly from attribute to attribute. For Empathy the rules say:
"You break down in despair or self-pity. You must either explode in a violent outburst, kicking and breaking everything around you, or withdraw from everyone around you."
This mean that someone that is broken in Empathy can go nuts. What this means in gameplay will vary from one situation to another but it can mean that the "bullied" will try to kicking and breaking the source of his misery, namely the "bully". If we purely looking at rule, I could in such a situation rule that the character is allowed to kick the "target" for his despair or self-pity in an uncontrolled way, meaning attacking, throwing vases, etc. but no dodging or parrying (i.e no tactical combat, pure rage).
“Thanks for noticin' me.” - Eeyore