Jake didn't want to lose anyone important, which was why his objective changed from simply surviving to victory. If he could kill this thing here and now, then he would, but if he couldn't, then he was going to have to wait until Miranda brought forth help. What he knew was that he wasn't going to die here, not today and not by some monster of all things.
The Phantasm heeded its master's orders and fluttered towards the monster. It tried to swat at it with tendrils, but the attacks phased through it as if it wasn't even there. This confused the beast, but it pivoted backward once it noticed that the Phantasm was trying to do something. Sadly, it was too late for that. The Phantasm infested the monster's body.