The one who helped Commander Matins kill King Saru, besides the backstabbing Kalduce, was another, none other than the Battle Group's Chief Think Tank, Henrik Larson.
At first, he led several Psychics that had been deployed, engaging in Spiritual Power confrontations with multiple Orc Shamans, successfully suppressing these Orc Shamans and preventing them from interfering with the human troops. Then, Kalduce personally made a move, striking these few Orc Shamans and eliminating them, thereby liberating his own Psychics. This set the stage for the joint attack on Saru later on.
After the Orc Warlord was killed, the situation aboard the Firebath Nova was practically decided.
At this point, the overall state of the naval battle was also quite clear.
Gu Hang was on board the Firebath Nova himself, but he wasn't concerned with the boarding Orcs at all.