The science was very stupid this episode for many reasons, and when someone thinks that it is okay because it is a fantasy show... and rules don't apply... the writer is making stupid decisions.
Clara's character is supposed to be on a rebound from 11 because 12 looks too old for her (never mind 11 was over 1000 years old when they met) and is in a very forced relationship with Danny Pink (who besides being able to leap into the air as if he has super powers, has no other qualities I like and is actually in the process of controlling her with threats of leaving) her responses to 12 are probably clouded by this relationship, at least, that is what the writing staff are probably told to write. I am not liking this... the only thing I do like is 12's character is close to some of the classic Doctors - even a little like 9 - and I like this personality BUT being over 2000 years old shouldn't be making mistakes about emotional relationships nor not understanding behavior of humans. In fact, he should be pretty wise by this time, not confused by the age of a student.
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Clara's character is supposed to be on a rebound from 11 because 12 looks too old for her (never mind 11 was over 1000 years old when they met) and is in a very forced relationship with Danny Pink (who besides being able to leap into the air as if he has super powers, has no other qualities I like and is actually in the process of controlling her with threats of leaving) her responses to 12 are probably clouded by this relationship, at least, that is what the writing staff are probably told to write. I am not liking this... the only thing I do like is 12's character is close to some of the classic Doctors - even a little like 9 - and I like this personality BUT being over 2000 years old shouldn't be making mistakes about emotional relationships nor not understanding behavior of humans. In fact, he should be pretty wise by this time, not confused by the age of a student.