Just out of curiosity...
What's the processor on the PC you're running now?
Using DOSBOX? If so, how many Cycles is it configured for?
I noticed on many of my older machines (that were signifigantly faster than the system that I originally played on) the AI would do things that it shouldn't...
For example: on one game, playing on the the "recomended system reqirements" had a few seconds to move from cover to cover.
But playing on a dual core of double the mhz per core, if I poked my head out for a second....
I was instantly spotted, and the alarm raised.
Might be what's going on here, your only have your scope up for 3 seconds, but instead of being 75,000,000 cycles (25mhz), it been 6-12,000,000,000 cycles (2-4ghz).
So in CPU cycle terms, it been ~4 minutes.
Might be what's going on...
Or I might be completely off, and/or crazy, you never know!
Barracuda