I'm pretty sure these decisions depend on each casino and what rules they follow.
In general, I believe:
1) Call is binding. He/She can not raise or fold. The only way his action is changed is if player 3 raises...then player 4 has all the available options.
2) Same deal. Raise is binding unless player 3 raises. Then player 4 would full action available.
I believe the floor would just tell player 3 to act...then tell all players of the floor ruling....to not give player 3 additional advantage.
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