Hey guys, I'm new here, but I'm a part of the thread on bungie.net that is helping with this whole thing...
Aside from the intro... I would like to stress that some of the cooler things that happen in the halo games usually happens in the upper difficulties. (ie Heroic and Legendary).
It may be a bother, but bungie wouldn't want us to get the easter egg easily right? Aside from that if the glyphs have something against combat... I have no problem running from legendary enemies!