Empathy and kindness is the top, fundamental value I hold professionally, but I am struggling to understand why you would re-assess after a single incident. If a large fraction of candidates showed signs of extreme stress, sure. One candidate, though, isn't enough to determine anything meaningful, in my opinion. As Mack "Bumpy" Freeholder famously said "one thrown laptop is on them, but two thrown laptops is on me!"
Yes it did, at first. It was one of the first times we presented the question, so we didn't have a great signal on its efficacy just yet. However, other red flags emerged during the interview process, and we decided to try the question out a few more times, with a lot more success. And the rest is history.
Did the laptop throwing make you think you'd gone too far?