Alex had already made it out of the tunnel and he could already see another body getting tossed out from the window. From what he knows the gray field academy actually covers elemental school, middle school, and high school. So far he has not seen a Lost below the age of thirteen. It's rare for a deviant to awaken his talents at such a young age, meaning trying to wield a beast gear at that age is no different from suicide. At least the Tyrant gang knows that much and maybe only hold them as hostages so he didn't have to bother about them, the guardians will find a way to rescue them.
Right now the closest building one can find in the middle school, so Alex didn't hesitate to dash forward. His appearance already drew the attention of the new Losts created and they were nearly twenty in number, dashing towards him.