The "climber" (the window in Romanelli's room is located at a height of more than three and a half metres from the ground underneath, cf. photo 11 from the relevant dossier) would also need to rely on the fact that the shutters were not actually latched, and also that the ‚scuri‛ ,which are the wooden panels [scuri=non-louvered shutters in interior of room] that usually constitute the outer side (or the inner, depending on the point of view) of the window [attached to the outer edge of the inner side of the window- frame] had not been fastened to the window-frame to which the broken pane was attached; otherwise it would not have been possible to open them from the outside; nor would it have been possible, even breaking the glass, to make a hole giving access to the house, [37] since if these inner panels had been closed, they would have continued to provide an adequate obstacle to the possibility of opening the window, in spite of the broken pane.
Admitting that the climber decided to bet, in a sense, on the presence of both of these "favourable" - in fact, indispensable - conditions, the climber would then have had to climb up once, from underneath the window of Romanelli's room, in order to open the shutters; then he would have had to get the large rock, and having selected the point where he wanted to break the window, to throw it (it seems impossible to accept that he actually made the climb while carrying the large rock, and threw it against the window at the risk of being hit by glass falling from the pane thus shattered).
He would then have to have returned underneath Romanelli's window for the second climb, and through the broken glass, open the window (balanced on his knees or feet on the outside part of the windowsill) otherwise he would not have been able to pass his arm through the hole in the glass made by the stone) and reach up to the latch that fastened the window casements, necessarily latched since otherwise, if the casements had not been latched, it would not have been necessary to throw a rock at all, but just to open the shutters and climb inside.
This scenario appears totally unlikely, given the effort involved (going twice underneath the window, going up to throw the stone, scaling the wall twice) and taking into account the uncertainty of success (having to count on the two favourable circumstances indicated above), with a repetition of movements and behaviours, all of which could easily be seen by anyone who happened to be passing by on the street or actually coming into the house.