NA teams have a bias towards momentum, if they are halted in their game substantially money broke etc. it can be a good time to close out a bet even if they are still way ahead. Doesnt have to be true of all them but they tend to lack the best IGL and discipline to their play, I hope Liquid prove me wrong as almost every team that has success has alot of anti strat work by other top teams bought in to bear against them so failures during a series are normal. The game vs Vitality was very close, hope they resolve to do even better and learn from it.
That momentum build-up and carrying the game wasn't a thing in NA. It was mostly because of teams from American organizers or American individualism that allow star players to make surprise calls or plays. I remember SK Gaming in their era didn't have this momentum tho their players are from Brazil. Right now, with the influence of both EU and South American, NA teams are more likely to adopt that play style, prefer discipline over momentum build-up by the star players.
I also think only a few teams right now that play well under the pressure or stressful Bo5 games:
_Vitality, obvious cause they're all well-experienced players, has been thru a lot of big CSGO events.
_Navi, kinda sad cause with Bo3 or Bo1, they don't have enough time to show off this special talent.
_Faze, maybe, karrigan is a super igl and doesn't scare over a long period of the game, still don't know why Faze lost to Cloud9.
_Heroic, define the underdog mentality, can comeback no matter how bad their situation is.
Anyways, Liquid did their best honestly. I thought it would be a much faster game for Vitality, 3-1 if in map 3, Vitality end it without dragging to the OT.