Joe and Blackhole were exceptional at dealing with a large number of enemies. Their spells were mostly AOE offensive types. The demons that managed to breach through the chokepoint at the valley's entrance had to suffer their bombardments.
The two worked together with the monsters John summoned earlier using Call Monster Horde. These monsters had routed the demons accompanying Beelzebub earlier. They now engaged the demons coming from the valley.
Joe used Spectral Squad and covered more ground. Most of the demons were defeated by Joe, Blackhole, and the monsters before reaching the place where Beelzebub was trapped. Those who arrived were too few and low on health to break through the Delta Station to get to Trinity. Hence, the situation continued as it was.
The rate by which they reduced Beelzebub's HP increased with the help of Paytowin and John's elite summons.
"Is the Omega Battle Mech or the Mothership Sigma not available?" John asked Paytowin.