How do I get Gromelon's sword?

Hint 1 of 6:

You will have to distract him long enough so that he won't notice when you
try to take it.

Hint 2 of 6:

Have you tried walking on the roof yet?  The goblins always jump back down
once they've been up there.

Hint 3 of 6:

And they always jump onto the same place.

Hint 4 of 6:

Maybe you could put something where they land -- something that would squirt
in Gromelon's face when you land on it.

Hint 5 of 6:

How about the mayonnaise on this screen?

Hint 6 of 6:

Just use it on the spot where the goblins land and then jump off the roof
(F) to throw the mayonnaise in the guard's face.