I think Bonnie would win via sneaking up on the Deino and then LS diffing. Even if the Deino gets a grip on Bonnie, he could just force its jaws apart with his LS. Also the AP gap is not that large, and Bonnie’s survivability is much greater, so even if the Deino is able to do enough damage to take off a limb, Bonnie would be much less inconvenienced by that compared to the Deino taking similar damage. Also, if it ended up coming down to attrition, Bonnie not being able to die from blood loss, and actually having justifcations for Superhuman stamina on his profile significantly trumps the Deino. While its possible for Bonnie to just be stupid and try to just punch it to death without trying to LS tear it at all, I think that scenario is a lot less likely than Bonnie just eventually trying to rip something off, and then doing it more once he sees it works so well.