Big respect to you Mess, but, that's not what happened on the first goal.
The pass went across from the right D to the left D and Andersen is tracking it, I could see it quite clearly (even though i can't go to games and have to watch on tv/internet and you don't get as much view as you would if you were there live), but, Andy knows and senses, (cause both of his Dmen are to his left and the shot is coming from the his right side).
There's a opposing player bearing down on him or kind of in front of him, but, his Dmen are to his left and he's got to know that if and when the puck comes back off the boards, it's coming right to the opposing player and his dmen can't play it.
He could have (even shots that are quite wide of the net can easily be deflected, esp. since he was so far out) deflected it into the corner (maybe, again, i''m just saying this is a possibility), but, if he doesn't deflect it, which he didn't, he has to to be aware (i'm positive he was) that the puck is wide and coming hard back off the boards, and that's his mistake.
If he doesn't challenge and go out so far, but just moves over to the post, when the puck comes back off the boards, the player (whose too close him) has really nothing to shoot at, but, he's so far out, that he actually can turn around and the player is practically behind him and then taps it in.
Sorry, this is not a hindsight kind of thing, he just played it wrong, jmho.