Well bigger than their thumb for sure.
And do you really want to survive after a nuclear blast decimates the area and rains radiation down upon you?
When a nuke goes off I personally want to be as close to 0 I can be to it or on the opposite side of the planet. That’s it.
Likely they are in range of the sonic boom that will deafen them and shatter the house at best and the resulting vacuum would create a fire storm that sucks in, to a horrible inferno. If you see the blast it’s too late for most things but never to late to shout:
Opa! And throw some plates.
Ah the therapist where it’s more like you are paying to have a friend you can have meaningful conversations about life with while they mostly try to gaslight you to be happy. The majority of them.