After drawing the opening two Tests, England need a win in Grenada to seal a confidence-boosting series victory.
Instead, the tourists ended day three on 103 for eight, which leaves them with a lead of just 10 going into the fourth day of action.
England's toothless display left former captain Michael Vaughan particularly angry.
"To see the England team just capitulate like that with no spirit or fight - I am afraid there are big questions to ask," Vaughan said on BT Sport. "The lack of resistance in this England team is non-existent.
"As ex-players, you watch and think: 'yes, it is tough, bubble life, Covid throughout these past two years with England travelling, it has been pretty difficult at times.'
"But when you continuously see them just collapse and shown no fight, no spirit and togetherness… I hear all the time that the England squad are quite tight and have a good spirit. No they haven't.
"Spirit happens on the pitch, it doesn't happen on the beach or by the pool. It happens on the pitch when you get partnerships working together and you fight your way through tricky situations. You don't gift the opposition an easy win."
Vaughan also underlined England's mentality problems, and accused the side of not having the right attitude to deliver a series victory.
He added: "It is about winning, it is as simple as that, it is high-level sport.
"You can try and put a positive on the first two games, there were some good individual performances, but England didn't win.
"When the pressure goes on and you are expecting a team to perform, 0-0 in a series, England have completely been so far hammered in the game.
"Everything is about discipline and making strong, disciplined cricket for long periods of time. England just haven't been able to do that for a good period of time now.
"It is just the pressure. The England side can't seem to mentally be able to cope with the pressure."