[The above synchrony of movement bewteen E and F is very interesting, look at the video. F takes a biscuit from the packet as if to give it to E, E extends her hand to take it, but F then physically retracts the offer of a biscuit and asks the above question. E also quickly retracts her extended hand. It is as if F wants E to "learn" for her biscuit by doing what he asks first.]