why are they called destroying?
Having destroyed one side, it is poised to hurl a thunderbolt.
The Destroying Angel and Daemons of Evil Interrupting the Orgies of the Vicious and Intemperate
Having destroyed one side of the temple, it is poised to hurl a thunderbolt. 
what is 'the destroying angel and daemons of evil interrupting the orgies of the vicious and intemperate'? An oil painting on canvas. what does its composition consist of? An ornate imaginary classical temple is under attack from a destroying angel and a group of daemons.
wiki:18902711
The Destroying Angel and Daemons of Evil Interrupting the Orgies of the Vicious and Intemperate [SEP] Composition
"The Destroying Angel" is a visionary work, depicting a wholly imaginary scene rather than a scene from history, literature or mythology. It measures 127.8 cm by 101.9 cm (50 in by 40 in), and depicts an ornate imaginary classical temple. The temple and its occupants are under attack from a destroying angel and a group of daemons, who are in the process of abducting its human occupants. The angel itself is wreathed in smoke in the centre of the image. Having destroyed one side of the temple, it is poised to hurl a thunderbolt. Below the angel, daemons attack a group of around 25 semi-naked human figures.