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A comment on Proof-Of-Work is a Decentralized Clock. Parent comment

Re:Proof-Of-Work is a Decentralized Clock by nordsieck on Tuesday April 17, 2018 @05:04PM (#16862311)
No. In bitcoin, you don't spend from an account. You spend "unspent transaction output" or UTXO.

There is no unspent transaction that B owns, so any transaction B creates to send money to C is invalid.

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Re:Proof-Of-Work is a Decentralized Clock by tylersmith on Tuesday April 17, 2018 @06:05PM (#16862724)
They can't actually do it simultaneously but after A sends to B, B can create a transaction spending that output to C and both transactions can occur in the same block.
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