Nora does the same thing. She sits on the floor sniffiing, nostrils flaring and everything first, saying "Oooh, that smells really good, can I have some??" Then she scoots closer and closer, and then goes for the kill and tries to swipe food off of our trays.
I don't know how old your little food stealer is, but mine is almost 6. Jordan has never been that slick about it though. One time he stole beef jerky right out of my mouth, and of coarse bit my lip in the process. Just last night he was pulling on my plate to see what I had.