Pulisic scored the fourth goal of their 4-2 first-leg win in their round of 16 tie.
He said: "It was instinctive for me to put my foot down.
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"If I have a goal of goals and assists for this season? Yes, but the most important thing is to go as far as possible in this competition and try to win it.
"We are happy with the double advantage, but perhaps with one more man we could have done more and had a larger advantage.
"But just think about tonight, let's think about next Thursday's return leg in Prague."