Part 66: Extras for Forest Heart
Extras - Sounds
Briefing music, from the soundtrack: 15 Forest Heart.mp3
Extras - Mission Images
The unused pre-mission image shows our scout making his melodramatic entrance.
The defeat screen shows a forest giant meeting a fiery end, although that can't actually happen in this mission. Word is, fire was supposed to be part of Myth gameplay (and a weakness of forest giants), but they didn't get fire working with acceptable performance until Myth 2.
Extras - Units
As they did with the trow, Bungie toyed with giving a ranged attack to the forest giant. It probably involved ripping up some rock/earth and hurling it, since this animation is still around in the gamedata: