Rush believes there's still more to come from Torres, who struck the winner at Aston Villa last night.
"The thing that impressed me most about him when he arrived at the club was that he would not let anyone bully him," Rush said.
"The time that stands out for me is when they played Chelsea. John Terry gave him a hard time. He booted him early on to say 'Welcome to the English game' but he handled it, overcame it and scored a fantastic goal.
"There was also a time at Reading in the Carling Cup when he got clattered early on and scored three.
"In England, where it's the hardest and toughest league in the world to play in, that matters as much as your skill. All the greats have the same mentality.
"If someone tries to bully you, you stand up to them. They're kicking you because they don't want you on the pitch and, if you go off, that means the defender has won.
"He plays for the team and works hard. He has to in the team he's in. He's improved on that.
"He wasn't as good when he first came over but there have been times this season when the opposition keeper has rolled the ball out to the defender and Torres has chased him down.
"That's what I used to do too. That's been a big improvement in his game this year. He's still learning but he is going to get better."