Why you should deadlift on solid ground

Here's me attempting a 475 lbs conventional deadlift with straps no belt. I could only get it halfway up my shin.  The main reason for not being able to pull it higher was the floor I was deadlifting on was semi-hard rubberized foam. You can clearly see in the video my feet shifting and wobbling. That kind of lack of stability lends itself to loss of power, and if I hadn't switched to stiff legged deadlifting on two forty five lb plates immediately after this attempt I would have probably experienced a minor vertebra disc slippage and would have to stop working out due to a spine injury.