Predalien (caste)

Two bouts:

Round one, Engineer is unarmed.

Round two, Engineer has an Engineer gun (like seen in Fire and Stone) as well as a sword.

Both fights occur on an open field! Personally, I would probably say that the Engineer takes both fights. Iirc, we see an Engineer (presumably) solo an entire Xenomorph hive with its bare hands in Fire and Stone.