The brothers step up alongside Tarq. In concert they lash out at one of the crabs, trying to account for the odd bending of light in water.

Spoiler: Nathaniel and Gerald, round 1
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Nathaniel Sotheby
M CG Human Inquisitor (SancSlay/RavHunt/Heretic), Level 1, Init 4, HP 10/11, Speed 30
AC 18, Touch 14, Flat-footed 14, CMD 14, Fort 4, Ref 4, Will 5, CMB 0, Base Attack Bonus 0
Glaive +4 (1d10, x3)
Daggers +4 (1d4, 19-20, x2)
Mace, Light +4 (1d6, x2)
Chain Shirt (+4 Armor, +4 Dex)
Abilities Str 10, Dex 18, Con 15, Int 8, Wis 16, Cha 10
Condition Dirty fighter: +1 damage when flanking
Child of the Shadows: +2 init in urban settings
Studied target w/ move action
Spells (1st level)
Heightened awareness: 1/1

study the crab at AF/14, to have bonuses when it arrives.
5-foot step to AI/11
Attack the crab at AH/13 with glaive
(1d20+4)[21] glaive
(1d20+4)[18] CC? (24+, x3)
(1d10)[3] damage
(2d10)[6] crit bonus

If an AoO is triggered:
Spoiler: AoO
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[(1d20+4)[19] glaive (+1 all round if it's AF/14)
(1d20+4)[8] CC? (24+, x3)
(1d10)[7] damage
(2d10)[18] crit bonus


Gerald Sotheby
M CG Human Cavalier (Disciple of Pike), Level 1, Init 1, HP 13/14, Speed 20
AC 16, Touch 11, Flat-footed 15, CMD 16, Fort 5, Ref 1, Will 0, CMB +5, Base Attack Bonus 1
Bardiche +5 (1d10+6, 19-20, x2)
Lucerne hammer +5 (1d12+6, x2)
Halberd +5 (1d10+6, x3)
Banded Mail (+7 Armor, +1 Dex)
Abilities Str 19, Dex 13, Con 16, Int 7, Wis 10, Cha 13
Condition Challenge: 0/1
Tactician: 1/1
Honorable Champion: 1/1
Bigger they are: +1 AC vs large enemies, +2 vs huge

Move to AG/11
Attacking with hammer again
(1d20+5)[24] attack
(1d20+5)[6] CC (25, x2)
(1d12+6)[13] damage
(1d12+6)[10] crit bonus

Spoiler: AoO:
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(1d20+5)[19] attack
(1d20+5)[9] CC (25, x2)
(1d12+6)[17] damage
(1d12+6)[17] crit bonus