Board Thread:Questions and Answers/@comment-30303676-20161023153004/@comment-28895263-20161025060415

I'll wear the "nerd" badge proudly!

I figure that Arya still had that immortality chip that the Doctor gave to Ashildr in "The Girl Who Died". (Varys borrowed her TARDIS.)

Sorry.

There is one rational explanation for Arya surviving that attack. She was expecting it: she had planned to lead the Waif on a chase, ending in the dark room where she had hidden Needle. (No plan survives first contact with the enemy.)

But Arya had dressed for the occasion. She was wearing multiple layers of tightly-woven linen; the same kind of padding worn under plate armor. That was enough to deflect the Waif's blade, and turn what would have been a fatal wound into a superficial one.

But we're getting off-topic for this thread.