But, I do agree that the flight thing is likely only a mental block; after all, evidence suggests that Pierrot's pegasus magic is all in place!

[Pierrot briefly pantomimes sculpting a cloud house out of thin air.]

...But that is why we have friends, is it not? After all, we talk to our friends about our problems.

[His words are firmly empathetic, but not unkind, and he follows up with a gentle glance in Fluttershy's direction.]