Cut A Steel Fence Post with Carbon Tip Blade

In this clip I cut a steel fence post with a reciprocating saw using a carbon blade.
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[@AJAXfootball95]

how do you get rid of the rest of it? How do you make the walkway flush and get rid of the leftover knob?

[@Jasonsdesignshop]

You cut it at the bottom the first time. The blade will bend flush with the cement and be ok.