Baptizand

Let the baptizands stand naked in the water. A deacon should step down in like manner into the water with the baptizand […] and say, “Dost thou believe in God the Father almighty?” and the baptizand should reply, “I believe”.

Baptism is such a transaction, where the baptisand formally gives himself into the hands of a new Master.

Is it the believer (baptisand) or a third party (minister of baptism) who neither should nor can be certain of the faith?

With the change to an administered immersion, the baptisms of John and Christians were likely still the ducking of the head of the standing baptizand into the water […]"