The beam, seen through the gap in the buildings.
The angel stops firing.
The skyscraper melts.
The pillar of light contracts.
SE <<Biiiii dmdmdm>>
thewayneiac: In a strange blooper, the beam seems to be coming from the building rather than from Ramiel.
Fireand'chutes77: Maybe there isn't a "blooper" with the beam weapon after all. Much like tornadoes aren't all that visible until they begin sucking up dirt (or a light beam until you add smoke), the beam isn't visible until it "ingests" the material in the building and turns it to visible iridescent plasma.
UrsusArctos: Same impression, but I remember seeing a production drawing of the same scene that showed the beam coming from the building rather than Ramiel. Seems like someone goofed up early on, and the animators just carried through with the mistake. Strange. (Ah, here it is! [1])
Dr. Nick: If the beam is supposed to be normally invisible, they're not being consistent about it. I'd label this as a pretty straightforward blooper.