Well, at first it seems like they'll have to block the door "old-fashioned" way because it not like there's a whole ton of metal and time compared to wood and occasionally stone sculptures. But thankfully Hugo spots a metal one, zips over to position it just right- then the angel proves he has a mouth when the bottom of his face, his maw, opens up to reveal dragon-like teeth as well as green and yellow...

*PWING-FWOOOOOSH*

... not-quite-fire breath. But it works for melting the sculpture.