NCAA Rule 28.2 which was instituted some years back stipulates that the Goalie if assessed a Major Penalty must go to the box, serve his penalty himself, Backup goes in to replace him, gets a 1 minute warmup. Until 1942 Goalies at the NHL level did in fact serve their own Penalties and no Backup's (mandate of 2 Goalies dressed didnt start until 65/66)... starting in 1939 the NHL allowed one of the skaters defending the open net on the Penalty kill to borrow the Goalies stick & gloves... With scoring down in the NHL, some have suggested the League adopt the NCAA Rule or even goes back to the pre-1942 rule with a twist; both the Starting Goalie serving the penalty in the Box & the Backup stapled to the bench. So be it on 5 on 4, 5 on 3 or whatever, no Goalie at all, up to the Defencemen & Forwards defending on the Penalty Kill to keep it out.