Lending Calculator There Was A Situation Where Someone Lent My Friend A Calculator And I Took It Up And Put It Down An Soon After

There was a situation where someone lent my friend a calculator and i took it up and put it down an soon after - lending calculator

it stopped working .. and is now "demanding" We are both the cost to take. I need to show a way that I can not legally responsible because they hired to find my friend, she is responsible for any damage that occurs to him.