Therefore there is really no way that your friend received their first transaction at the address but didn't receive the second transaction(if the transactions were actually sent to them, of course), unlesshe deleted the address from his wallet which i'm not sure if it's even possible.
Tell him to refresh his wallet, or even export his wallet to another wallet provider.
There's no way to delete a wallet address on any platform or on the blockchain.info specifically.
And to OP that's normal since he is using blockchain which a HD wallet. Even the wallet generates an new address he can receive funds sent on the first wallet address. The sent funds should reflect on the overall balance of your friend's wallet.