ANY club can go down this way in hockey if you give the opponents a chance and stir them up. Goals can happen fast and meltdowns too. The best team in history had this happen to them.
Its not about being the only culprit. Archibald was the catalyst of this loss, through one mind numbingly stupid and selfish penalty. I mean you would expect it to be Kassian but he was good today. Archie can't be doing that as a bit role player. His job on the ice is to not get scored against, and not contribute to goals against. Thats his job, his primary job. he's here for no other reason than to be RESPONSIBLE.
Not to mention his line was also out there for 2 other GA in the game.