How sure are we about the scorching? In the dictionary this refers to burn/fire. And if the burning debris is scattered over hundreds of meters, as the one source reported, then this suggest an in-flight fire.
Further, scorching of a wreckage area typically occurs when the burning wreckage sets the surrounding vegetation alight. Now a glacier doesn't burn that well.
We would like to get this confirmed. Maybe it is just paint marks from the chopper scratching across the ice?