Side Kick to Opponent's Knee and You Miss 

Missed Side Kick To the Knee and Recovery
As emphasized, the Side Kick to the knee is, perhaps, our most formidable and debilitating long-range weapon. It requires precision. Therefore, you may miss and here is recovery option to press your attack home.
If you are facing an adversary in an opposite outlet stance (left side to right side or right side to left side), you can simply continue the Side Kick through by extending your kicking leg and sliding your base leg slightly to acquire extended range followed by a Backlist or #3 Elbow Strike.
If you facing an adversary and are in the same outlet stance (left side to left side or right side to right side) you must immediately deliver a Backlist or #3 Elbow Strike before or as you kicking leg touches the ground followed by additional combative as necessary.