brododragon
Veteran
@Etothepi is correct, but at least how I do Petrus F2L, you shouldn’t get into that situation.What if one of the F2L edges is where the cross edge normally goes? How do I take that out without disturbing EO/The pair already there? Doing M' U2 M ruins EO
What I do is place the cross piece before placing the first pair (you can still make the first pair, just not place it). Because of this, it doesn't matter where you put the cross piece in. If one of the F2L edges is where you would put the cross, just do an F move (or R or L, depending on your orientation), and you've got a place to put the cross. Once you've placed the cross piece, you can take the F2L edge out and continue like normal.