the weight would be shifting forwards to the front leg as the strike lands - the leg would be completely loaded as the strike follows through. For added meat there is a sinking into the front leg as the strike lands which also loads the leg effectively for whatever comes next.
The natural follow up if I'd done a right backfist (it kind arcs over the top of the elbow and lands at a downward angle, follows through towards the right hip). The consequence of the strike is that the left side of my waist is loaded and ready to go so the flow would go into a left arm strike of some sort. That's what's in the form so that's what would probably come out Because of the weighting and waist torque a left side attack is inevitable - possibly using the upper body recoil from the left strike to launch another low line kick.
just some ideas - I'm cheating really and just spouting the form but it works so nerr
Experience is something you don't get until just after you need it