I didn't say it was bad design, though I can see why my position can be interpreted that way. I said I don't see how it's good design. Is the juice worth the squeeze?
Consider the classic AD&D format. You come to a door, the Rogue checks it, unlocks it, steps back. Fighter opens the door. Roll for initiative! Immediately you get jumped by wraith spiders! Unlike you, they don't have a speed factor added to their initiative for their attacks- each of which is a level drain attack! As your allies flee in terror, you realize that now that you're engaged in melee, you open yourself up to a free attack from each and every level draining monster you are now in melee with to flee. Which of course, unless you stated that action when you rolled initiative (and why would you, it was just a bunch of spiders?), you're now forced to take your attacks and wait until next turn....*
You died because...you did what you were supposed to do? Of course, AD&D is full of situations like this, such as all the "haha, gotcha" monsters that murder you because you didn't think a bunny rabbit was a serious threat.
The only upside I can see to this is...the Fighter dies. A lot. And everyone has a chuckle at the player's expense.
*You might be saying, "aw, that would never happen". I assure you it totally did, in Ruins of Undermountain II: The Deep levels.