Spoiler: OOC VerglasThat'll need a Concentration check - DC 11, 10 for the motion, 1 for the level of the spell.
Spoiler: OOC EveryoneAssuming this check comes off (which it will absent a natural 1), people, then Verglas will certainly make it to the other side of the gap without a problem. One point, though, if it's of interest - whilst the avariel might be a relatively rare subspecies of elf, there is enough general familiarity from history (and indeed horror stories told around fires in Horizon's halls and holds) for people to realise that Verglas has assumed the form of one of humanity's hated oppressors. There might not be specific familiarity with the subspecies, but avariel are elven enough that they're recognisably elven in features.
Your characters' reactions of course are completely a matter for you, but there might be any range of reactions from disquiet (for those who've most been trained or been around magic) to disgust. (Or indeed it could be just indifference or no reaction at all - again, your reactions are up to you/your characters.) An analogue might be one's reaction to seeing someone who's turned themselves into a living, breathing copy of a certain well-known political tyrant of history. Or another reaction might be your character considering invoking elven forms, tricks, or so on as invoking bad luck, something that needs the placation of the spirits, or even the gods themselves, a little like someone making the gesture of the evil eye in our own world. Or tossing salt over your shoulder after you've spilled it, or refusing to light three candles from one match - superstitions in our world have a stronger intensity in Horizon if only because the power of the gods and spirits is evident rather than supposed.