Answer:
In many hall ways you would stand if not with me in hand.
I begin and have no end. Eventually I will be the end of all that has begun.
I am a seed with three letters in my name. Remove the last two and I still sound the same. What am I?
To you, rude would I never be, though I flag my tongue for all to see. What am I?
I am the ultimate killing machine used not once but TWICE I can be made by humans.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?