Turning feet away or toward the door - This indicates the person would like to leave (flight response).
Covering mouth with hand - This behavior indicates that even though the person is talking there is something they wish to not say (freeze response).
Eyes suddenly open wide - This may indicate the individual has perceived a sudden threat and is looking for an escape route (freeze response).
Moving away or leaning back - This behavior usually indicates the person feels threatened and is putting distance between him or her and the perceived threat (flight response).