The Tain

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I don't think the effect you're trying to accomplish is possible. Once the mesh is stained, it's stained until you reload the map. There may be a trick you can use to work around it. One might be to use a grass-green for the blood color and then "paint over" the stains in a given area with...

Your CRTL is activating properly and firing on time. The problem is visibility. Myth updates your visibility mask -- that is, its list of which units are close enough to your units to be visible on the screen -- only once every two to three seconds or so. So when your units 'port in, there's a delay...