Expedition detonations and monsters spawning timings.

Dirty mages start casting 1s delay deadly explosions before they are even spawned thats cheating! Here included is a frame by frame perfectly made paint collage. It is not lag or delays (14ms frames at 30ms)

imgur.com/a/s8GQbVA I tried posting it as an image and it would not work its fine.

Frame 1: Mobs are spawning looking away and everything looks normal.(notice the 2 bubbles)
Frame 2: I fire ma lazors.
Frame 3: I miss because they are not spawned yet and my fully loaded herald confirms.
Frame 4: Shot 2 and they are real now they can be killed yay!
Frame 5: My super badass arrows hit and im about to delete all of those fools but there is something wrong.
Frame 6: I think its like the millions of mobs i killed before them and go next to blow up the next mobs.
Next frame is just a death screen, if i did not record i would have no clue what went wrong. I'm not mad its all humour but that should not be a thing.