Jørgen Jakob Friis
Finally it is a good point not to completely release the pin the just because somebody taps out - but of course one should strive to never pin harder than what the other person is able to take. As somebody stated in a different thread - (and I'm paraphrasing) Aikido can be very traumatizing if the actions of tori is not adapted to the ability of the uke. NEVER should we force somebody beyond what they can cope. Being a good sensei however does entail on the rare occasion to make people press the envelope just a bit.
On the assumption that sensei knows better than uke what they can "cope with"? Demonstrably, it was nage's judgment that was in error in this case...significantly so.
It ain't what you don't know that gets you...it's what you know that just ain't so.