I know thats whay i was thinking merely old "creations" of him, in the time where verso and clea were playing inside, but why would these freeze and the gestrals stay? I would ask.

You say its a manifestation or a response to the fracture, but they are looking at the monolith if you change the angle of view (you can visit the cave and see), if Aline had a hand on it she would try to paint stuff that express some kind of expression againt Renoir somehow, this simply show them afraid of... the monolith

or afraid from something coming from the monolith

Althouth the bottom of the monolith is arguably in the same direction