Yeah when it happened I literally had to rewind, partially because it was dark and hard to see, but even then I was like "umm what?".Heeeey..... Yeah! I've not seen the first Predator in ages, but wasn't it his helmet that provided the thermal vision?? That bone skull thingy in Prey didn't have lenses as far as I could tell. I just look at it; it doesn't even appear to have eyeholes.
It's a shame because that's the finale and arguably the most important scene of the film. I'm totally onboard with the idea, but the darts being homing? I guess? was too much. I sorta wonder if there was scene cut that explains that mechanic, and maybe they thought they could cut it and trust the audience. They do establish that he uses the laser marker, but I dont recall them ever showing where it comes from so I wasn't left angry so much as