Then the enemy human says "a-ha I'll surprise him by counter-attacking his territiory through that wormhole!"
*crunch*
Too bad it won't work.
The hole won't do damage until the end of your turn, so he could warp in, see the hole, and then leave in any direction.
I have personally had an LC fly right over the singularity with no ill effects.
Of course, laying mines & then opening the warp point would provide a similar effect
