It's a DC:10 Stealth check to dump your rum ration, whereas it's a DC:20 check to cast a spell unseen.
AoO: 1d20 + 4 ⇒ (10) + 4 = 14
Damage: 1d3 + 4 ⇒ (3) + 4 = 7
A worried look crosses Fipp's eyes as he circles around you. With a
glance at Plugg and Scourge he rushes you, fists raised. But a quick one, two punch drops the big lummox first to his knees and then to the deck as he topples over. The groans of the crowd as the fight is over before it even began is cut short as the sound of a whip crack fills the air.
"What's all this, then?" Scourge shouts as he enters the fighting circle. Gazing around at those assembled all he meets are down-turned eyes as no one wants to draw his ire. "I aim to keep discipline among you scurvy lot and this is what I get? Fighting among the crew? Fighting each other is not good for discipline, if you want to fight you'll get plenty of opportunity once we run across a merchantman or two. Until that time discipline shall be maintained, and it looks like I'm going to have to drive that point home now don't I?" he sneers at Percival "Three lashes for you, fop. Now take him." As he says this last your arms are grabbed from behind by two sailors, A tall Vudrani man named Maheem and a grizzled Dwarf named Tam. The two of them drag you toward the mainmast where Scourge stands waiting, his whip coiled in his hand.