Don't take anything here as being 100% correct. Ask questions if you want me to explain anything.
Snubbers protect the swithcing element by taking the power that usually dissipated on the element and dissipating it elsewhere.
Circuit with snubbers:
http://everycircuit.com/circuit/4902049831452672
High current with high Vds = high power dissipation.
So, any point on the upper right of the XY scope = high power = bad.
Points in the lower left = low power = good.
