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Once, I was playing Heroes 5 and was about to capture a mine, and the enemy units were positioned in such a way that I could simply take the mine!
P.S. I don't know if this happens to everyone, but even non-summoned elementals die like summoned units, and sometimes this bluish flash (with which they die) turns reddish.
There's also this graphical bug with the elemental tower: if you build as many as possible so that they all fit in the camera (