Title says it all really~
Saw a hunter spawn, went to shoot him and got machine-gunned down by his Hannibal-E.
He spawned on the top of A's building and /already/ had heavy ammo, and it's not possible that he picked up ammo as he spawned as the area was empty of ammo.
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I have seen things that left me wondering about the heavy ammo, but couldn't the sudden appearance of a Hunter have been the end of a blink jump? Is the top of that building a normal spawn point?