One part of the soon to be law banning bump stocks reads thusly:
As used in this section, the term “bump fire stock” means a conversion kit, a tool, an accessory, or a device used to alter the rate of fire of a firearm to mimic automatic weapon fire or which is used to increase the rate of fire to a faster rate than is possible for a person to fire such semiautomatic firearm unassisted by a kit, a tool, an accessory, or a device.
Read the interesting part again:
to a faster rate than is possible for a person to fire such semiautomatic firearm
Which person? Some people can do this:
Because 8 rounds in one second is a cyclic rate of 480 rounds per minute.