In the Fantasy Variation...
If Black takes this pawn
After White Takes Back...
Black can then offer this pawn
Which if not taken, puts pressure on this pawn
If White takes this pawn
Black has a clever trap for White
So White has to put his Knight here
If Black takes this pawn
White can develop his Bishop
If Black pins the Knight to the Queen (bad move)
White takes this pawn
Then puts Black King in check
And then takes the Bishop