What are you talking about? how can he get stabbed when his above Bee? Look at the chapter again. Minato doesn't have the intent to kill. You know that the mark is on Bee right? Minato can be infront of him in no time if he wanted to. FtG is instantaneous and if bee tried to stab him, he will cocked first then stab and it will take time.if minato tried that he would have gotten stabbed in the heart or throat or something .. and what? minato had intention to kill and was moving in for it untill the kunai was pressed against his stomach... then he had a talk with them..
Minato can do what he did with Tobi. You can't tell if he will appear behind you, infront, or above you. In Kakashi gaiden, he was able to defeat 50 men in a blink of an eye. Doing simple math, the average time for him to kill each shinobi is 6-8 millisecond. This is 6-8/1000 of a second we're talking about. If he really had the intent to kill then theres no way for Bee to counter the attack.
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