in all fairness though they're very cute and there's nothing wrong with making the entire outside portion of your fortress a giant equine/goat/cat/bird sanctuary for your animal trainers to frolic in while you send miner after miner to their watery graves (after all three of the fortress' military squads were killed or maimed fighting two forgotten beasts that made their way out of the caverns into the hallway leading up to the fortress) in the cavern fifteen layers beneath all the unicorn vomit....we're rich in rope reed and barley
yep, drawbridges still transition instantly from "closed" to "open", and anything caught underneath when it opens back up will be rendered incompatible with existence and erased before it even has time to realize what happened
except for forgotten beasts, which i think prevent it from opening?