David already notices those people who are coming towards him. Well, he became quite alert because there could be a chance they would tell him to give all the loot.
Previously even though he noticed a group of people in front of those Monsters he did not notice those people belonged to the Falcon school. But he already recognized them.
Fortunately, the dead bodies of the Monsters already begin to disappear and David already begins to pick up the loot. At this time those people already came close to him and were just waiting for him to finish picking up the loot. Well, the teacher already signals everyone not to move from their place as this could cause Miss Understanding.