I'm going to have to watch this again, as I'd not actually noticed it! But maybe he had a tear in his eye through fear?
Grima had betrayed his own people and now Saruman was his only 'friend', and he possibly (most likely, actually) felt afraid of him and his power. Seeing this army assembled could have brought his troubled emotions to the fore. He may have felt both awe and disgust if he was going through a moment of intense shock and fear.
I also think Alatar may be on to something suggesting that thoughts of Eowyn may have crossed his mind at that point.
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Gordon's alive!
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