Thank you very much for giving detailed knowledge about Bitcoin to your friend because in this case your friend knew a lot about Bitcoin and invested in Bitcoin which played an important role in Bitcoin Adoption.
Your friend has no loss for investing in Bitcoin but in the current situation he should have made a lot of profit if he invested. Moreover, if your friend has invested in this correction and has planned with a long-term accumulation goal, then he will definitely get a lot of profit in the future.