Let me just re say your question more correctly, "Lets say someone has 10 knives in his hand and stabs someone trying to hurt him. How would you say 'He stabbed the person 10 times in one go/in one stab'? " or You could say "He stabbed the person 10 times in one stab using all 10 of his knives" There are many other ways you could say what you wanted but those ways would be perfectly acceptable.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.