Hello,Again! Let's assume opponent....

[SittingBull]

"A" bets 7th Str and it's about 7 to 1 against his bluffing in this spot.
The pot is offering 3 to 1 for "B" to make the call.
PlayerA proceeds to pick up his chips,indicating that he is going to make the bet.
Is there ANYTHING PlayerB can do to try to determine whether or not playerA is ,in fact,bluffing in this spot??

Hmmmm
Just wondering.
Happy pokering,
Sitting Bull