Well.. that WAS an episode, I was NOT expecting it to end like that :O I can't wait for the final 2 episodes..
Although, just for argument sake
Why couldn't they save Clara? Why couldn't Doctor take the tatoo, die and regenerate? Or force Ashildr to take it.. She can't die, after all, she should just regenerate back?
Also, as for Miss C. I really doubt it's the final end of her.. She died 2 times on screen already, just to pop back in his life.. We sure will see her in one of the 2 remaining episodes.. At least that's what my guts tell me..
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Also, trying to stay as spoiler free as possible is proving very satisfying for me. Hard, but it's much more enjoyable to watch this season without checing leaks and spoilers.. i can't wait for the season end :O
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As for the episode itself, I love how it, connected to Flatline. Both by Rigsy's character and general theme of the episode. In both Clara wanted/was the Doctor. In Flatline she succeded in outsmarting the enemy, used her 'rules of the Doctor' to justify what she was doing and pulled it off. But Doctor warned her, that, even though she was a exceptional doctor, she didn't do good. This time, she again, believed she is Doctor 2.0. She tried to outsmart the enemy, but this time reality bit her, and she paid her price.. She essentionally overstepped her role, as so many people on this forums (and not only) have been expressing for quite some time.. And she died.
It also goes way back to her origin story, as a girl who dies, even though Doctor tries to save her.. So maybe it is the end of Clara Oswald?
Still sad though, I still hoped she would get to live a life with Danny somehow :/