This is a difficult situation, especially for the younger goaltender. Goalies up to 13 (and even older) do not have the longest attention span & when they are inactive (few shots) their concentration is not as sharp as it should could be.
My answer to this challenge is to attempt to explain to them that their concentration & focus should work something like a traffic light:
Puck is in the other end = GREEN LIGHT - I am relaxed & just watching the play happen
Puck enters the neutral zone = ORANGE LIGHT – I am in a relaxed, focused mode; I count the number of attackers; I look to see if the puck carrier is one of their better players; I note if he shoots right or left handed; I note if we have any back checkers coming back; I look to see if my defensmen are in good position; I move quickly into position in a relaxed stance & get proper angle as soon as the puck crosses the red line
Puck crosses my blue line = RED LIGHT – I am completely 100% focused & in full stance BUT I look off the puck whenever I can to see if the puck carrier has any passing options or if my defensemen are still available to intercept passes. I maintain a high level of alertness even when my own player has possession of the puck anywhere in the zone (even behind the net) and until the puck has moved outside my own blue line & the light turns to ORANGE.

