[hormiga_electrica]

Bueno Bell, en lenguaje de elfo esto significa una sola cosa.
 Anda haciendo un lugar en tu cama esta noche.

Estuve ojeando un poco respecto a la LN, y por lo visto hay cosas del setting muy interesantes que el anime por una cuestion de tiempo apenas menciona o no lo hace en absoluto, como por ejemplo si un dios puede morir o no, etc. 

Spoiler:

I thought it somewhat out of place. It's supposed to be a get-kicked-out-of-the-world offense, not really justified by the situation which looked almost under control.

This is a burst of "Might of Heaven"(神威 in japanese) ( Or "God authority" if you it better that way). Every god has it as a natural aura. In the anime, it was completely skipped, so obviously you don't know that, but in the LN, it's often talked about. That's the main reason for why in danmachi, you can recognise if someone is a god or not by his sheer "presence" and "authority" (think of it like an absolute charisma emanating from them, overwhelming for mortals). Usually, gods are just radiating a little of it. When they entered the dungeon, Hestia and Hermes made sure that they completely cut it off to avoid being detected by the dungeon. What hestia did was simply a burst of it, suddenly releasing 神威 to convince the mortals to obey her. She didn't use her divine power. If she did, that would be back to the heaven afterwards and forever for Hestia, end of danmachi as a story.

They exaggerated it clearly in the anime. Shin'i (神威) is something that's completely natural from gods in danmachi~ As a mater of fact, when Bell reunited with Hestia on the 18th floor, he asked her why she was "different from usual". That's because gods usually release an aura of "God Authority" at all time, whereas she wasn't in the dungeon. What Hestia did there was just stopping restraining it, and maybe releasing more than usual on this, but that's about it.