Can any one elaborate on how the convert HIVE to HBD function works in the Keychain?

"You deposit collateral (HIVE), then you are given HBD up front worth half of the collateral amount (minus a 5% fee). Your official final payment is in 3.5 days. At that point remaining collateral (HIVE) is returned."

So if I understand this correct

I convert $10 HIVE. I would receive $4.75 HBD up front. But I struggle to comprehend the function after this. Essentially I have $5 still in conversion for 3.5d. My question is do I get $5 more HBD or HIVE returned?

Asking for a friend 😎