You be better off on you knees to begine with. This would be my stratagy...
At the sound of the whistle i would grab the nearest kid i could find and throw it into the biggest crowd of kids i could see to slow them down... then i would back myself into a corner and get on my knees... It sounds like a bad move, but ill explain why its the best one.
If you have 30 kids, they can only pack so many into a corner so the obvious idea here is to bottle neck them... thus the most youd have to face at one time is 3 or 4. Some quick jabbing would take them out pretty quickly. As they begin to fall, they slow them selves down as they try to climb overtop their fallen commrads. After about 10 or 15 of them are piled up in front of you, you can then begin using them as projectiles.... kinda like cannon balls. Just launch one into the crowd and see how many get hit. Pretty soon theyll be scared to death of your power, and brutal tactics and then theyd just sit down and cry.
With those tactics i dont see any reason why any 6' 200lb man couldnt totaly manhandle 30 5yr kids.
When i was 16 i used to play with younger neighborhood kids just because i babysat them at the time. They were about 7-10 yrs old and i took on all 8 of them several times w/o too much problem.
Theres also a girl i work with that weighs all of 90lbs and i striat lifted her up by her neck with my right arm the other day. i told her i could... she didnt believe me, so i did. I can only imagine how fun a 50lb kid would be to throw