Jeremy leaped from building to building to avoid the attacks from Allen's Serrata opponent. His next goal was to reach Gary so they could switch opponents.
Since Gary had a gun which was good in long ranged combat, he was a better suit to fight against this Serrata who could fire magic bullets from a long distance.
One thing he noticed was how the Serrata didn't seem to have a lock on just one of them. They have initial targets, but after Allen and him switched enemies, the Serrata that Allen previously fought was now following him.
Whoosh. Whoosh.
As Jeremy was running from the rooftop of the buildings, he was being rained with the magic bullets that the Serrata was firing. He was having a hard time with it especially since the Serrata that targeted Gary brought the man away from them.