Monero double spends in the txpool

Question

If a transaction A enters the txpool at timepoint A', and then a second transaction B enters the txpool at timepoint B' at a location distant enough to have not received information about transaction A, how does the Monero protocol handle this double spend attempt?

Answer 1

First one to get in a block wins, there can be no other way as far as I understand. I mean, who has the authority to say which one came first? For this, we have PoW and the blockchain - to avoid having to rely on "someone said this came first". Until it's mined, it's undefined.