Ooooo nasty! Not something you see everyday. I would imagine they were back at max 230kts
As it failed to retract, they would have been at a slow speed anyway as they would not be much above flaps up manoeuvring when they noticed it, so any roll would have been kept to a minimum. Had it happened at 300kts/.65, then it might have been a different situation!
What harm can a recycle do?
If I extend to the FULL extended position, like in the picture above, and cannot solve the problem, nothing has changed.
I fly at the same 230 kts speed.
Very true, but carrying out an airtest on flight controls (when you have a certain amount of roll already) with a plane full of passengers is not something that Boeing can be seen to recommend. What happens if you recycle and now 2 leading edges on the same side stay out? Your problems are now a bit more serious and the roll that much worse. Okay, it's still controllable, but why make your life potentially more difficult? The QRH is written to get you on the ground safely without the potential for making problems worse. They don't want too much messing about up there!