This is a rather unique bug to cause, but it can happen, i literally just witnessed it. (and it was my fault if I am honest)
In the final stage.
Close all but one rift.
Deploy tractor mines near the Dread
Take dread down to either 66 or 33 percent (the run away trigger points)
Watch the dread try to rift, but be stuck indefinitely in the tractor mines.
O_o
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