Finally, Allen came to the next floor. Well just after entering the floor he was now standing in the safe zone. As you know, the Monster won't attack him. But the moment you leave this zone and enter the danger zone you will get attacked by those Monsters.
'Sigh, most likely don't Monster will not come here until I did not leave that safe zone.'
Well, he wanted to observe the power of those Monsters and their status so he thought he would do that from the safe zone, but most likely this wasn't possible.
So Allen did not waste any more time and already entered the danger zone. As he expected the moment he entered the danger zone, he instantly felt the aura of a monster from a different direction. Also if you look around him then you will see those grasses that are the same size as the trees.