Hazmi took part in the unit's ill-fated mission to Vygoire, assigned to investigate a Dominion lab complex that had stopped responding to hails. Terrestrial and orbital observation showed that while the complex had suffered damage, it appeared to be from natural causes, such as a landslide. As per urban-recon protocols, the facility was investigated, the unit discovering human remains, but no living scientists. The unit continued its recon while its supporting battlecruiser was called out-system for emergency escort duty, set to return when it could.
The marines headed into the jungle. Sergeant Norwood Doakes assigned Chen to investigate a clearing that had a lot of bent and scarred trees. After returning to the group, he reported that there were large quadrupedal tracks through the clearing. As if on cue, a roar sounded through the area. It was at this point that one of the marines started freaking out, screaming about coordinates, gods, and a "Great One." He ran into the jungle, and an ultralisk came charging back in his place. The squad fought the ultralisk, but took 33% losses, retreating into a ravine the ultralisk could not follow them through. They were then ambushed by the scientists they were looking for, though they threw spears that could not pierce their CMC Powered Combat Suits. Among them was Vera Langridge, who was immune to the spores but stated that the squad was not, and that the entire squad was now infected.
The team found the lead scientist, Gerhardt van Rijn, back at his village, who stated that the Great One's hunger was more wanton since they had arrived, and that they must leave. The ultralisk then arrived to the village, and the scientists began running up to it to be consumed. Torch Seven retreated to the lab complex, and devised a plan to kill the ultralisk.
Torch Seven then set up a vespene gas bomb from the, which it would lure the Great One into and collapse a ravine on top of it. On the crossing of the planet's two moons, the cultists held a ceremony for the Great One that summoned him, and Doakes used this opportunity to lure him to the bomb. This worked, but did not kill the Great One. In the ensuing battle, the Great One was killed by the combined fire of Torch Seven and a lucky shot by Doakes, but only Vera, Doakes and nine members of Torch Seven survived. It is unknown if Chen was among those nine, though they too were killed by Vera upon return to the Scion.