Tottenham boss Jose Mourinho says facing West Ham will be about cutting out their errors.
It is especially relevant ahead of Sunday's trip to West Ham. Spurs collapsed from 3-0 up in the 81st minute and ended up drawing 3-3 in the dramatic first fixture between the pair in October.
Mourinho said: "Football is a game of emotions and when an opponent is, I'm sorry to use the word, almost dead and then you give them life, emotions change.
"And the opponent becomes a different team than it was.
"You can teach how to play the transition when you are winning and the opponent is trying to recover and the ambition to go for a bigger result.
"What you cannot teach is to put the ball in the net. That is a fundamental part of the killer instinct and you can work the tactical combinations, the counter-attack combinations that keep the pressure high but in the end, you have to kill."
