Those that triggered their abilities all decided to hide it because they hadn't seen others have it.
Being different from others is bad, especially if they aren't strong enough yet.
All people with superpowers have weak superpowers at the very beginning, so it wasn't very advantageous.
So, those people who triggered their abilities couldn't even be arrogant or brag about having superpowers at the beginning because their abilities were still very weak and wouldn't cause damage at all.
"After they asked the soldier how they triggered his ability, they called for volunteers and asked the others to try to trigger their abilities.
Afterwards, some soldiers succeeded in triggering their abilities.
George and Jason were also two of the people who first triggered their abilities at that time.
When the continued heavy rain came, the base focused on letting the soldiers trigger their abilities.