He was fallen (ēn epipeptōkos). Periphrastic past perfect active of epipiptō, old verb. The participle is neuter here because of the grammatical gender of pneuma, but the translation should be “he” (natural gender), not “it.” We should not use “it” for the Holy Spirit.
Only they had been baptized (monon de babaptisōmenoi hupērchon). Periphrastic past perfect passive of baptizō with huparchō (see Act 8:9proupērchon), instead of ēsan.
Into the name (eis to onoma). Better, in the name (See note on Act 2:38).