Taz's eyes widen at the barrage of carefully aimed attacks, and go even wider as the tentacles coil around Marius's neck. This creature is incredibly dangerous. She pulls her pick into her hand, while her other channels another blast of water at the abhorent creature.

Spoiler: Actions
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So my reading of the rules: since the choker did not take -20 on the grapple attempt, it is also grappled, so it has -4 dex (AC -2). Taz is firing into melee, so -4, then +1 for attacks against abberations.

Move: Draw pick
Standard: Kinetic blast choker: (1d20+0)[14] Damage: (1d6+6)[8]

Spoiler: Character Details
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Tazmara Stonesong
F NG Dwarf Kineticist (Aquakineticist), Level 1, Init 2, HP 13/13, Speed 20
AC 15, Touch 12, Flat-footed 13, CMD 13, Fort 6, Ref 5, Will 1, CMB +1, Base Attack Bonus 0
PBS Water Blast +3 (1d6+6, x2)
Heavy Pick +1 (1d6+1, x4)
Studded Leather (+3 Armor, +2 Dex)
Burn 0/7