As already noted, he uses his best, most appropriate skill. If his best magical skill is something like "Defend against Spirits" then that is the one to use. If it is an affinity for Earthworms, then it probably isn't (unless your player can come up with a real doozy of an explanation!)
Note that if he defeats the Fear Spirit in this combat, it will just go away unless he has the Spirit Combat ability (or similar). With the Spirit Combat ability, he can get an immediate 1-use task out of the spirit (this could include "go bug that guy over there" or possibly even "never bother me again" if he got a high enough victory). If he just happened to have an appropriate empty fetish lying around, he could even bind the spirit (though happening to have a convenient empty fetish lying around is a low probablility event.).
RR
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