The two vampire hunting teams walked down the streets of new york as vampire planes (aquired during Messiah's conquest of airports) crashed into buildings around them. Van helsing screamed as a large chunk of metal smashed into his leg, he solved this by cutting his leg off.
In the heart of the statue of liberty Messiah adressed the assembled confrence of her kind "We shall extinguish the flame that is humanity within the month, using a special team known as The AMAZING horsemen! They shall bring the end of humanity for us." The first horseman headed into the battlefield of new york. Pestilence.
The vampire hunters saw him riding over the warzone, spreading gas over the city. They saw the citizens of new york fall as the sickness spread. Then the horseman stopped and sat upon the roof of the nearest tower. "Right then hunters, we head for that building and kill the horseman!" Doctor Hawke said to the team, "HEY I give the orders around here! Secondly great plan!"
The teams fought their way to the tower through hoardes of vampires. By the time they reached the tower Van helsing was already dying and in the blink of an eye he cut off the head of both pestilence and the nearest vampire and used the vampire head to bite himself. He became the enemy to fight the enemy.