Legal implication of shutting another’s windows from the outside

Question

Bob’s neighbour is playing loud music inside their property with the windows open. Bob knocks on the window asking them to kindly lower the volume. Nobody appears to be home, so Bob gently pushes his neighbour’s window shut. The neighbour later returns home and irately shouts at Bob demanding that he not touch his windows. What is the legal position of this demand?

Answer 1

Bob must not interfere with another person's property without permission.

It is either trespass to land or trespass to chattels, or both, depending on how the window pane is classified and depending on who owns the land just adjacent to the window pane.

The music, kind requests, no one being home, gentleness of the interference, and irate shouting are irrelevant to the analysis.