My dearest Sera

Raising his gaze, Riggs smirk yet, it didn't show arrogance nor did it displayed anxiousness. He bet, "All in." 

The man across Riggs stared at him for several seconds, trying to analyze his expression. In this game of poker, one of the things that a player needed to take notice was their opponent's facial expression. 

'Is he bluffing? What cards are on his hand? He doesn't have any money on him if he loses. No, it only takes a royal flush to beat mine. Does he have them? Huh, that needs the biggest luck. That's right.' The man calculated their situation and looking at his straight flush, he regained confidence.

"All in."

Once the man uttered his last remarks, it caused a huge uproar from the bystander as they were fired up with this unnerving atmosphere.