I think Martin realized he blew that by his reaction after Marchand scored.
Honestly though, a lot of goalies are not active enough with their stick in terms of preventing passes right across their crease. I don't know if it just happens too fast for them to get their stick on the pass, if they are worried about deflecting the pass right out in front or into the net, or exactly what keeps goalies from stopping that cross crease pass. I do know if you go for a poke and miss you are in a bad spot for a few seconds afterwards.
Sure looks simple on TV to just put that big paddle in the way and stop that pass.