I cant believe that this person sent 0.1 Ether with 2,100 Ether transaction fee. I am pretty sure that this person is crying out right now and just shaking his / her head repeatedly. What will you do if this happens to you? How will you comfort your self at a time like this? 2,100 Ethereum for transaction fee really is a big amount and unfair on that person but a mistake was already made. I hope that he can contact the miner who processed that transaction for reimbursement which is I think possible. Look on the reference below.
https://etherscan.io/tx/0x1f73b43dc9c48cc131a931fac7095de9e5eba0c5184ec0c5c5f1f32efa2a6babIt was unbelievable when I saw it and for a moment I thought about how devastated I would feel I made that sort of mistake and then I realised I am safe with imtoken and eidoo