Fᴀsᴛ ғᴀᴛ ʙᴜʀɴɪɴɢ, ᴏɴᴇ-ᴛᴏᴜᴄʜ ᴜsᴇ, ᴡɪᴛɴᴇss ᴛʜᴇ ʟɪɢʜᴛ ᴛʀᴀɴsғᴏʀᴍᴀᴛɪᴏɴ