"Boom"
A huge explosion was created and the surrounding 1 km area was fully destroyed. But that wasn't over as the monsters not far away from that place were already preparing their attack and in less than a second they were already preparing and shooting in that direction.
On the other hand as you can see Allen already escaped from that place using his movement technique at full speed and also he already brought out his gun to shoot toward those Monsters. Naturally he was now present inside of the Dungeon and he was now fighting with those level 51 Monsters.
Fortunately after breaking through you can say fighting those level 50 Monsters became easier for him as he was able to use the full power of his bloodline. So after killing the Boss monster of that floor he came to the next floor where naturally he was at night now facing those level 51 monsters.