Ok, so here is the thing:
Most of the times I do the UFO throwing the yoyo to the right (in order to tighten the string) I get decent results.
BUT, when I throw it to the left (making the awkward movement shown by Andre in the video) I ALWAYS hit my hand. The yoyo shoots back instantly as soon as it gets to the end of the string.
I haven’t figured it out what to do. :-\