Zinovia pushes her frail body, shifting her position to the party's flank. From here, she can launch her fire without fear of injuring her allies. She weaves the spell, blasting the troll.

Spoiler
Show
Zinovia will move diagonally up to the left two squares (i.e., she'll be standing one square left of Viktor when she's done). She'll then fire her burning hands diagonally to the right, so the cone hits two squares of the troll, and nothing else.

Burning hands (Ref DC 18 for half): (4d4+1)[11]