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Well if you see it this way he use Wind Chakra to enhance the shurinkens . And MC use Earth Chakra to enhance the sword or weapon to make it more durable.
and Hiruzen was worried they wanted him out already and take over as hokage with their reputation as a Tsunade. He was suppressing opposition like Sakumo or others at the time.
Minato- Am I a Joke to You!!