The Poland goalkeeper saved twice in the FA Cup semifinal shootout win over Wigan Athletic.
"To be honest with you I did some homework but none of them [the Wigan penalty takers] were on my list!" he told Arsenal Player.
"The guys who stepped up to take penalties [were different] so I was just guessing. It was more intuition rather than my homework that I'd done.
"I was surprised that [Jordi] Gomez didn't step up as the first one. Then I saw Caldwell and Collison taking the penalties, so I was just guessing.
"I did look at YouTube and things like that, but I didn't see anything of Collison or Caldwell on there."
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