The initial attackers transferred back a small amount of btc to Protonmail to communicate that "somebody with great power" had come in for the kill after them:

The initial attackers transferred back a small amount of btc to Protonmail to communicate that "somebody with great power" had come in for the kill after them: https://blockchain.info/tx/7fca8fb2ee6d0bee0544fa8b9653ecd1798e8a3402ec64906d9fe9f3c2deead7 https://blockchain.info/tx/7fca8fb2ee6d0bee0544fa8b9653ecd17...