filling in for Oops knowledge(nature):1d20 + 6 ⇒ (9) + 6 = 15
With his known affinity for fire, Oops realizes that the Jack-o'-Lantern also will use fire as an attack.
If you would like to know anything else feel free to ask, giving this to you for free being where you are and I'm keeping things moving.
Jumping up on the chair and realizing that fire may not be the best defense here, he manages to lob an acid splash out of the window at the Jack-'o-Lantern.
Ranged vs. Touch:1d20 + 2 ⇒ (1) + 2 = 3 Which regretfully misses even with the bardic and bless I forgot to put in.