If I recall correctly, there are also LCL bubbles in 2.22 when Shinji gets stabbed in the hands by Sahaquiel. (He doesn't get stabbed in the TV series, so I don't have anything there for reference.) I can't remember if the LCL goes back to yellow-orange there as well, though.
I wonder if it was just done for dramatization or if we're meant to think Ramiel was disrupting the internal mechanics that enable the transition of LCL from liquid to gas. Shame it didn't stay gaseous, since water is a way better heat conductor than air-- Shinji could have been enjoying himself a nice sauna instead of getting boiled like a lobster.