Both transactions will probably confirm at the same time, so essentially they were simultaneous. And bitcoin supports transactions that build on each other so they have no problem to confirm. I can sign a transaction and "fund" it a few minutes later. They are both unconfirmed anyway until they can both confirm.
Both did confirm at the same time so for blockchain purposes both did happen at the same time. Blockchain.info also attempts to keep track of the time the network first "saw" the transaction and in this case they clearly made a mistake