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Blood: Correct hearing velocity when transitioning through ror #964

Job	Run time
Windows MSYS2 x86_64 GCC	10m 47s
Windows MSYS2 i686 GCC	10m 35s
Windows MSYS2 x86_64 GCC without SDL	10m 3s
Linux GCC	4m 52s
Linux GCC SDL 1.2	3m 55s
Linux Clang	6m 9s
Linux Clang without GL	5m 39s
Linux Clang without Polymer	6m 25s
macOS Clang	3m 15s
	1h 1m 40s

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