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Outside of that, get a small thunderbolt hub if you can find one, make sure it has a power plug, and use your adapter for that, then plug the firewire adapter into the hub and your device to the firewire adapter. You shouldn't get any problem with power as the device already has power and will bypass the firewire power output path altogether. Try plugging the firewire device into it's own power source first (if it has one), then turn it on, and then plug it into your adaptor. If you have a thunderbolt controller attached to that, usually means you have usb-c at usb3.1, with thunderbolt 3 controller attached, which has more capability to adapt to the thunderbolt connector, and provide enough power for your thunderbolt to firewire. Standard usb-c is called lightning, and while it will function normally with thunderbolt, it's current rating is much too low for firewire. Here's your problem: Your usb port is the one you're using like a thunderbolt adapter.
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