... well, many things. Primarily that involve being picked up.
Or touching her - because that's just too darn close to being picked up.
If Lucy sees you pick up another bunny (like for weekly exam and grooming), she moves her alert status to Defcon 1. She dives for shelter in the corner of the room blocked by a heavy wooden desk and which gives her two exit routes away from the humans. She stays under there, watching the human feet traipsing around the room. When she feels the alert has passed (like when we've left the room), she will venture out to check out what havoc we have wreaked in cleaning their pen and brushing her fellow bunnies.
But if it turns out the human is bringing treats, this stance also lets her run towards the reward.