I would warn anyone who is wanting to recover any of your blockchain.info account.

Don't ever give any of your mnemonic words to any strangers out there who are claiming that they can recover your accounts/passwords/bitcoins. Don't trust someone with your important recovery words.

It's possible that he will be able to gain access to your wallet with your recovery words but he can steal your balance and will return nothing to you so avoid dealing with this type of person.