I take the list of responses, and remove all text excluding what was implied to me.
example:
[quote=420blazeit360noscopes]No thanks on the demon force.
327k on the Full 512x512 Textures.
(Said reply to you) 18k on the 512x512 Head Texture.[/quote]
Simply remove the text from the quotes that don't apply to you. In your case, it would look something like the following:
[quote=420blazeit360noscopes](Said reply to you) 18k on the 512x512 Head Texture.[/quote]
I went ahead and added [noparse][/noparse] tags for your convenience.