I have looked the words up. Before this it is block and counter. There is the no blocks in karate crowd who never really explain what they mean. Semi free is an opportunity to use the oppenents momentum against them. Most Shotokan techniques are longer distance so you have to make distance to get them to work. The uke has closed the distance for you so you are trying to pick them off as they come in. Draw them in and parry and strike at the same time. Same way as you are trying to take the centre in fencing.
Do not move to early or they will follow you they should almost touch before you move. It depends what you want something that works or the stop start of techniques that you do for a grading that look great for slow grading instructors or film directors.
As you did not block and counter you may even pass it off as self defence?
This is why the Kihon of Karate make no sense with modern kumite, and this often causes confusion.
The fact that these (and other) basic techniques are considered fundamental to karate training and that you see these techniques all the time in all the kata but never really find a way to apply them effectively in long range (call it sport or budo according to your whim ) sparing should tell us that (despite modern thinking) it is not kata that is out of step with traditional karate but modern competition style kumite.
With modern kumite (runway style, bobbing back and forth in kiba dachi, heavy reliance of kizami zuke etc.. outside of the occasional use of hikite (which is awesome!) it's a slick form of kickboxing. (not that this is all bad, everyone has to develop and maintain kumite skills) I don't dislike it, but I don't like it either.
But what I don't like is Bad Karate being pawned off as Good Karate on the Internet. Example: I once saw a vid shot in some MMA gym (I think to legitimize the guys' skills/knowledge) where the Karateka demonstrated why traditional uke waza doesn't work. Everything he demonstrated was wrong, and it appeared the gentleman never advanced past the kihon stage with his Uke waza, With a partner in MMA gear, he planted himself at a boxer's range and never moved, then demonstrated while chambering and all... why tradition Uke waza doesn't work. Eyeballs rolling, I watched as he used a boxer guard (with forams up in the verticle cover-up position )to demonstrate what he perceived as a "real and practical" Age Uke. lol...
It's unfortunate that this gent didn't have Sensei who understood Uke is also in the chambering. Or that a Uke can be a shield technique.. or that 80% of the time its some form of counter-attack. It's unfortunate he wasn't taught as beginner Ikkyu from Heian Shodan, that the blocking waza from a Age uke is the open hand rising and that the completion of Age Uke is a step in forearm strike to the face/neck or chest of the opponent. (practical, realistic and very effective) Maybe then he would have spent his time as a kyu honing the angles of the block (open hand) and the attack to where he could step in a deliver it realm time. Same goes for all the other "Actual" Uke waza.