In my opinion, the holder of the debt got the better end of the deal here.
What if the converted amount dropped to a lower PPS value than the original debt? That would mean that the holder did not anticipate the PPS value to drop as low. It is not a better end of the deal at that point. I do understand what your saying. But if the conversion amount is less then the original debt, that works out bad for the holder. With no increase to the OS (zero dilution and conversion) we can say that is the case here.
70% drop in market cap with no fundamental change is pretty significant with no fundamental financial catalyst for the drop to represent the loss in market cap with no new shares added to the mix. The volume that has brought this PPS down is pretty dismal to the volume that brought the PPS up with no significant financial change. The company is still growing.
YU In any case when debt is converted into common it is good for both. Debt is debt if company goes bankrupt debt holder will be paid first and common share holders will get the last preference . Why do you think it is better end for debt holder? He is converting his money into common shares therefore he is taking more risk. I believe it is good for both.