Originally posted by dadudemon
Remember, Minato was using B as a "hostage" to make them cease and desist their aggression. He did not plan on killing B unless they were more aggressive. Once B took out his blade, it became a 1 movement for each of them. Minato notices B take out his blade at some point and that ruined Minato's hostage situation. So Minato had to give it up. If Minato was a cold-calculating ninja, like Danzo, he would not have hesitated and B would be dead.
I could see that, but it would be quite risky if the enemy decide it was worth it to take out the yellow flash.
Still, two other things:
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His sword handles are at the *top* of the sheaths, his hand at the bottom. He couldn't draw a blade from that position anyway.
There's only one sword in his back-sheath from the moment Minato appears even in the panel where his hand is further back.
Bee was simply ready for him.