He believes the Church, he hates his sins, is fully repentent, but at the baptismal font, he gets cold feet; he feels himself to be too addicted to grave sin and he can't bear to be baptized, because he would rather go to hell as a pagan than as an unfaithful Christian.
The (psychotic, apparently) priest holds him at gunpoint and baptizes him anyway. Is he justified? Why or why not?