The guy who died is Juha Bach in mangastream's version, here's the last page again:
Juha Bach's "I'm sorry" ended with point, which means his sentence ended, the last black panel was a voice he heard while he's dying/closing his eyes, someone was yelling "Juha Bach-sama", probably that blonde Quincy. The font is obviously yelling, not a man's word while dying. I think mangapanda did a mistake again, or could it be mangastream..?