Excellent point. Perhaps that was the real reason he freaked out?
Irvine had a clear memory of the past; he would've known who he was aiming at. I suppose he either pretended to lose it, or else really did lose his nerve.
That's probably part of the reason for his little chat with Squall earlier, too - the one where he asked about Squall's opinion of 'good' and 'evil'.
