Hello @Kaladensity ,
Thanks for posting at the Lenovo Community!
And I'm sorry to know that you're having difficulties resetting your device. Since the tablet immediately goes to Fastboot mode, I advise you to long-press its Power button for several seconds until it turns off. Next, turn it back on after a minute, then see if it will now boot properly. From there, try to enter the passcode that you're using to see if you'll be able to unlock it afterwards.
If it's still stuck inside Fastboot mode, it would be nice to drain the tablet's battery until it shuts down on its own. Once done, charge it back to full for 2 to 3 hours before you power it on again. Otherwise, try to access the Recovery Console menu instead to perform a factory reset on the machine by following the steps in video. Although, please note that this procedure will erase all data that's stored on the device.
Please tell us how it goes.
Thanks,
Adriel_Lenovo