This link has good pictures as reference https://www.nielasher.com/blogs/video-blog/trigger-point-therapy-fibularis-peroneus-longus-brevis-tertius

Of all the options listed, there are two that function in eversion of the foot (and would cause this patient pain): the fibularis brevis and fibularis tertius.

At this point, NBME expects us to have some super asinine knowledge, but here's why (I think) the answer is brevis and not tertius. The brevis muscle runs over the lateral malleolus and therefore directly over this fracture. The tertius takes a different route into the foot, since it arises from the medial fibula and so it runs anterior to the lat malleolus and wouldn't cross the fracture site.

the Fibularis Brevis is the only pure foot eversion muscle listed here. Everting his foot would exacerbate his injury and cause him more pain at the fracture

imo contraction of any of these muscles would be painful in this scenario

Of all the options listed, there are two that function in eversion of the foot (and would cause this patient pain): the fibularis brevis and fibularis tertius.

At this point, NBME expects us to have some super asinine knowledge, but here's why (I think) the answer is brevis and not tertius. The brevis muscle runs over the lateral malleolus and therefore directly over this fracture. The tertius takes a different route into the foot, since it arises from the medial fibula and so it runs anterior to the lat malleolus and wouldn't cross the fracture site.

Heres a good image https://teachmeanatomy.info/lower-limb/muscles/leg/lateral-compartment/