DnD 3.0 had a skill called innuendo which was for slipping in a secret message while talking. Sign language isn’t listed as a language EXCEPT for the drow sign language, but that’s a secret drow only language. So the hidden message for Bluff (in 3.5 dnd and pathfinder innuendo was removed and made part of bluff) is used for hand signals unless you use a house rule. Oh, and Blue being a Paladin has a high sense motive. Have a great weekend everyone!