Is blockchain.com in power to check where that money goes or there nothing now to do??
Everyone (including you) can check who the recipient of the BTC is.
But you'll only find out which address it is, basically the pseudonym. Without the link between a real identity, there is nothing more you can do since transactions are final.
Because of privacy, make sure to check it with Tor.
Since he is using blockchain.com, i doubt he cares about his privacy.