>>123420634Nandroids are relatively strong for their size, but yeah they probably wouldn't be able to do much against a determined assailant.
Unless they have some kind of protocol to override their built in safeties, and if that's like irl motors they could probably twist someone's joints until it break, at the cost of ruining their own limbs in the process.
To add power to an electric motor you just have to dump more power into it. Most motors can handle working beyond their safety margin in short bursts, but if you really want to you can pump all the power into it until it melt and catch fire.
For a desperate nandroid, that seems like an acceptable trade-off;
Parts of you get trashed beyond (simple) repair, but your child is safe.
Also the scream would hurt the kid too. Even if it is a better alternative then letting them get kidnapped, of course.