Yes, you can throw torches, but lanterns are delicate and may break open something like a very bad Molotov cocktail only the oil spreads out only a little and isn't much of a threat, though it will light an area.
>cast light on arrows
[Ashley] finally someone's thinking, go Alice!
Yes you can cast light on arrows and you could aim well enough to light them up reasonably well if not hit them, though the chances of that are small but non-zero. Keep in mind they will see you when you're aiming in case they also want to take some shots.
Ashley can see that they look tough (and of course she knows because I know) but "unknown" stats are subject to change for balance, fun and other reasons, though that would be unlikely. I hesitate to reroll anything once it's set because I trust my own judgement and consequences are part of my fun. Ashley however speaks genuinely and you have technically faced worse in my opinion though RNG Gods did like what just happened, three capable people attack a weak target all with advantage with damage potential of 30+HP damage yet only get 1 hit for 6, that's pretty far in your favor.
[Ashley] oh ok, pebbles and then shoot once they're visible, got it.
