Lightburn seems annoyed about the taste of salt water in its mouth after the failed attempt to attack. Hewitt could only instruct him to keep the attack going. Since no attack was made, he assumed that at the very least, they had the upperhand.

Spoiler: OOC
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Readied action
Attack the crabs? the moment he sees them.
Attack: (1d20+3)[10] Damage (1d6+2)[6]

Lightburn Outsider Eidolon 1 NG HP 11 / 11 Speed 40 ft Init 2 AC 12 Fort 3 Ref 4 Will 2 CMB +3 BAB 1 Bite 3 (1d6+2, x2) Str 14 (2) Dex 14 (2) Con 13 (1) Wis 10 (0) Int 7 (-2) Cha 11 (0)