"The revelation. It freed me. It killed me."
This article contains spoilers and plot details from Prototype 2.
Read the article at your own risk.
The Biobomber was encountered by Heller during his search for Dr Gutierrez. Heller had arrived at Gutierrez's last known location when the Biobomber (disguised as a Blackwatch soldier) spotted him. In order to create a distraction, he inserted a biobomb into a nearby soldier and amidst the confusion made his escape. However, Heller, using his hunting ability, was able to track him down and a fight ensued,the Biobomber is usually east from your position walking on the sidewalk opposite from the other military/blackwatch.
After a brief battle, the Biobomber fled once more until being cornered on a rooftop by Heller, taunting him the whole time in a typical Evolved fashion. He was then consumed shortly after, granting Heller his biobomb ability.