"Eh? Counter has brownies? We must investigate their secret recipe at all costs!"
*Five days and 50,000 casualties later, they remain at a stalemate on discovering each other's secret recipes.

For the percentage of people with abilities in the school, I'll raise it to 15%. With only 5% there would need to be tons and tons of people to have enough playable characters with abilities, far less have any decent sized battles going on.