With a grunt, Taz draws in a bit more power and launches a powerful blast of water attempting to shove the fishman onto uncertain footing.

Spoiler: Taz, Round 2
Show
Free: maintain point of burn - +1/+2 to att/dam of blast, also +5 cold resist.
Move: channel
Standard: pushing infusion water blast on the fishman (attempt push to AT18)
Attack: (1d20+6)[9] (cover not included if needed)
Damage: (2d6+9)[14]
(if attack hits) bull rush: (1d20+8)[14] (cover not relevant)

Spoiler: Taz stats
Show
Tazmara Stonesong
F NG Dwarf Kineticist (Aquakineticist), Level 23, Init 2, HP 33/33 (NL 3), DR Cold/pressure - 6 (1), Speed 20 / 20 (swim)
AC 15, Touch 12, Flat-footed 13, CMD 14, Fort 7, Ref 6, Will 2, CMB +3, Base Attack Bonus 2
PBS Water Blast +6 (2d6+9, x2)
Dagger +3 (+4 thrown) (1d4+2, 19-20/x2)
Heavy Pick +3 (1d6+1, x4)
Studded Leather (+3 Armor, +2 Dex)
Abilities Str 12, Dex 14, Con 19, Int 10, Wis 12, Cha 8
Condition Burn 1
Having a swim speed grants a +8 bonus on some swim checks (most others are not needed)