OOC:
I understood Ella cast her spell in round 1, assisted in tying up a halfling in round 2, and then moved to a shooting position in round 3. If the constraining of the halfling takes more time, she’ll still be busy at that during round 3, no problems.
Myrtha is a character from another game, my apologies. I often post in all games during a short period of time and sometimes get characters confused.
As to my understanding of the disposition of the neighboring halls, I guess I’m confused with the isometric representation and a previous explanation.
Here I had gotten the impression that there was a raised portcullis at the archway with a couple of halflings behind it (on top of the group that followed Roskelly). So, in my mind the space beyond the archway, being potentially closed between two portcullis, was a "kill box". Anyhow, I think I grasp the design of the space now.