your drawing is just confusing the situation

with the exception of a laminate jigsaw blade that pushes/cuts away from the base plate

all blades will pull the wood on to the base plate or table

so in your diagram the blade traveling down is at the back of the saw on a circular saw
or the front on a table saw

the blade on a circular saw will "lift" the wood onto the base plate and break out as the blade peirces the surface

so the answer to your question  on a circular saw the breakout is on the top  surface on a table saw its underneath

OK have it sorted now.

thanks for the help guys.

appreciated.
Juco