Casters making sure they are paying attention to the game. There were a few times when the main caster was on another screen typing something for quite a lenghty period with the camera sitting in FoW, while the co-caster was still calling action.
Also, if the situation arises if someone is solo casting, they need to keep the casting going, or at least keep talking about something. A few times (especially early game) there were long quiet periods which were a bit awkward.
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