The new Subnautica website has been launched!
Alternative to devourThe onos could bite down and drag along a marine for perhaps up to 10 seconds. Being attacked in this way would no longer be a 99% chance of death. Instead, other marines would be able to follow the onos and either make the onos release him (by causing significant damage) or defend him once the dragging is complete. Of course, the onos would head for a kharra stronghold, hopefully filled with other aliens ready to eat the marine.
Damage to the dragged marine would be limited during this time. As would the marine's firing of weapons.
P.S. I'd love to see a limited ragdoll effect apply to the marine as they flail along side the onos as they get carried away.