VGFacts

In the Magicant stage, a stage hazard called the Flying Man can be recruited by players to fight alongside with them until it gets knocked off stage by another player. Each time the Flying Man is defeated, a tombstone appears near where they would normally spawn. Once five tombstones have taken place, the Flying Man will no longer spawn during the round, much alike their roles in Earthbound 0/Mother and Earthbound/Mother 2, in which five of them are recruitable and will not come back once they are defeated, signified by the addition of tombstones near their house as each one is defeated.
[attachment=118]

[attachment=119]

I never noticed that, I think all I ever seen was one and I didn't know it was related to the bird man. That's kind of disturbing actually...