I have experienced kick back with a lightweight, direct drive, contractors type table saw. The base was kind of wobbly and the motor under powered.
When running out a 2x6 I guess I hit a tough section, the blade laboured, the base shifted which caused the blade to twist and grab. The 2x6 was then fired back.
Fortunately I was standing to the side, not behind the blade, as is my habit.
The saw did have a guard, but in this case it did not help.