"Additional info:
- If the first move for the opposing team is skip
- Whether or not your worm drowns or die at the end doesn't matter."
I can imagine something like Danger out"smarted" the rules somehow and since Kirill didn't make it clear, he probably suicided both teams equally, 2 worms can be alligned for banana, 1 worm can jump to water, etc. Kiry didn't even specify if you can use skip goes, or it has to be done in 1 turn.. so probably this way it took only 5 weapons to finish

So it took him multiple turns to suicide everyone. I guess that's not how this chally was meant to be done, but its okey : p