The Seastone represents the literal and metaphorical "cage" Doflamingo has placed over the entire island of Dressrosa. 2. Escalation of Stakes: The Big Mom Interference
This creates a unique psychological torture for Luffy, who has to watch his friend (Law) get brutalized while being unable to intervene directly. One Piece Episode 662
We see a brief but significant clash between . The Seastone represents the literal and metaphorical "cage"