Micro HDMI is essentially a one way connection, outbound to a display, and nothing else.
The Mac picked up and ran with FireWire much more than any other platform ever did. so there are a lot of older FireWire items and cables available. it was a viable connection method for connecting Rotating Hard drives at speed, until SSD drives became more important.
Once you get those files, as files, onto your Mac, you can copy them, as files, to a PC. The camera is the device that "packetizes" the video for transfer via FireWire. When the data gets to the Mac, it's just a file, not Live Video that has to be dealt with in real-time.