I'll describe my today's "exploration" right here.
The goal was to go to the end of Škrbina scree and over Škrbina then continue somehow. But it all ended at the gully head. Although unsuccessful, I'll show the route/direction anyway, if someone wants to repeat.
Around five I headed into Robanov kot. I left the marked path where it crosses the first dry streambed. First some time through sparse forest, then I took the streambed. Orientationally elegant, as it leads directly to the gully, but requires experience for such streambeds where a rock can give way and you dive headfirst.
When the streambed steepens under Krofička walls, the view to the scree opens. Then some easier bouldering is needed. Higher, where blockages are visible on the left (picture 14), it's good to stay right. I didn't, but that wasn't the last problem.
When the gully starts to narrow, it leads to a system of smooth jumps on the left where water rushes. This can be bypassed to the right, but you need to carefully follow when the jumps end and move back from the right to the gully center. Left traverses can be problematic. Nice ramps and grooves on the right tempted me towards Krofička. There I got stuck or wasn't sure anymore what lay ahead. I'd say difficulty was around II-III. Besides steepness, for descent the smooth rock or deposits of stones and sand were problematic, worst of all finding suitable anchors for abseil.
Anyway, I managed to descend and traverse back to the gully. Towards the head it becomes more scree-covered, especially right at the end where I barely held friction. Regarding the exit: right is smooth wall, left is nicely featured, I think no more than 10 meters, and it could be done somehow, but I started to hesitate. Due to scree the approach is hard anyway. Only the initial detail is problematic: steep slab undercut about half a meter below, due to height holds mainly on the right.
Finally my confidence left me and I headed back.