“Get behind me!” said Holt, and he began firing in the direction of the enemies. Lamb, however, did not retreat. He still had his weapon from their earlier battle against the creatures, and instead of hiding behind the Spartan, he stood next to him and opened fire. The handgun he used was surprisingly powerful, exploding with every round as he struggled to maintain its concussive jostling. Holt glanced briefly at him and, although Lamb couldn’t be certain, he thought he glimpsed silent approval in the Spartan’s helmet visor.
    The blasts from their weapons collided with the oncoming combatants.
    Lamb was worried that they would absorb the impact and continue forward with no problem. Instead the two closest spun their staves with lightning speed, remarkably blocking the incoming fire. But then the air around them seemed to bend again, and with a sudden snap of light they disappeared. The other two, however, persisted.

Halo: Hunters in the Dark Ch 11