Louis van Gaal's men appeared to be staring defeat in the face during their last 16 clash on Sunday, as Giovani Dos Santos gave the Central American nation a deserved lead just after the break.
But, the Dutch fought back and dominated the majority of the second half, drawing level in the 88th minute thanks to Wesley Sneijder.
"I didn't have the balls to shoot him through the middle," he told NIS.
"Arjen had the ball and asked 'would you like to take it?' When I was there I thought about changing (my mind), as I had missed the last time.
"(But) what an adrenaline rush. This is the best drug out there."
"It was very tough," the Manchester United forward added.
"When you are losing you want to attack, but you also need to make sure the spaces at the back are not too great. Then the heat, it made it extra hard.
"We now have to deal with in the next round. We are good, I believe in us and that we must continue to do so (believing in themselves)."
