Wouldnt the Dallas be destroyed if its warp core overloaded?
The core was set to explode the moment that the ship came out of warp. The trick here was ejecting the warp core the second before it came out of warp. That way, the core continued move for a second, leaving the ship behind (and throwing it suddenly out of warp). It was a small miracle that the Dallas survived this, but it was the only logical alternative to certain destruction. Tuvok is no dummy.
