Can I be sued for throwing a pamphlet in the air if it landing on a teacher by mistake?

Question Details:

A few days ago (it was the last day of school) a few friends and I threw a couple of pamphlets (4 pages thick with a soft cover) in the air. 1 of the pamphlets went over the wall and landed on a teacher on the other side. The teacher was not injured in anyway, however she threatened to take us to court and " take all our money". Can she sue all of us for this incident? Is she allowed to threaten us with taking all of our money? If she has no visible injuries or no medical certificate to prove that she was hurt, is it considered a criminal offence? All of the students involved where 18.

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