Since Horatio had already used the book, he decided to go all the way. He used Daemon Hell Gate before following up with Demonic Contract.
The emerged daemon received a great boost from the Demonic Contract. The nearby defenders also received the same boost, allowing them to fight off the tide of demons. With this boost, they overpowered the demons that tried to make a jump on Horatio. The daemon with the flaming axe clashed with the daemon Horatio summoned. Even the demon commander who devised the trap was forced to retreat.
What they weren't aware of was Belphegor was looking in their direction from outside the defensive walls. He stood still while his mini clones and floating ice weapons dealt with Wrath's maids.
Jygorth and the Montu spider were forced to battle other demons. The defender's number had reduced to a point where they couldn't have many combatants fighting Belphegor. Only Wrath's maids were still on that task, and they were one person short.