Salti tried to prey on a feather-legged spider, but the violent vibrations induced on the web made it fled to the nearest leaf.
Seen on an aloe. It appeared to be hunting the tiny orange aphids or mites on the leaves. This might be what can be seen in photo 3.
Photos are not very good. Spider moved around a lot, in a jerky motion.
Identified as Thyene inflata in a lab by Charles Haddad, but I'm still not convinced :)