Situation 1

He does not signal the infraction in any way.  (Rule Reference 409(b) Note 1.)

As soon as Team A acquires possession and control of the puck, he will blow the whistle to stop play and assess the penalty. The reason for not signaling is that this penalty is not considered a “team” penalty, but rather a “player” penalty. A result of the Referee signaling the penalty would be the substituting of a sixth skater for the Team B goalkeeper, and Team B is not entitled to this advantage.