OpenCore BigSur USB boot stalls out — help interpreting verbose logging?

I've completed my USB Big Sur installer, and switched it to DEBUG mode (according to the guide). Booting stalls out the same way each time. The logs saved to the USB drive's EFI partition all look like this (below). Can anyone help me interpret this, and pinpoint why my boot won't continue beyond this point?

Thanks in advance for any help or advice.

00:000 00:000 OC: OpenCore DBG-071-2021-07-05 is loading in Optional mode (0/0)...
00:030 00:030 OC: Boot timestamp - 2021.07.30...

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