Help on newborn booties pattern from baby knits made easy

The pattern has a weird way of casting off and I’m just having trouble understanding it.

Work edging
Next row: (casting off) *k2 pass first st over second so that 1st rem on RH needle as if casting off, place this 1 st back on LH needle, rep from * until 1st remains

When do I actually cast off? I’m just very confuse😖

This is a stretchier bind off.
Next row: (casting off) *k2 pass first st over second so that 1st rem on RH needle as if casting off, place this 1 st back on LH needle, rep from * until 1st remains

The portion italicized is where a stitch is bound off. The idea is that the first stitch is passed over the second and off the right hand needle.

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