Not sure...here are some other bits of output with "(to)":
O.k. - it appears this debugger simply doesn't show the destination. So we're good there - it was a red herring.
If we're still getting to "seek" and blowing up, that says that for whatever reason the -H isn't getting parsed correctly. Not sure what to do about that. If you get desperate, you might try to patch out the "do-boot" call at the end of the FCode on the ISO image, so it does the load but doesn't execute the do-boot.
Don't know what else to suggest.