Ambush dwarves and 3 buttons (Divinity: Original Sin 2)

People! I suffer the whole day , all dug up , no information anywhere about this no! The ambush of the dwarves , near the statue , there are 3 buttons. What I did not do , do not run, do not understand that they open and everything! Help! On the screenshot you can see the button at the top, left and right!