[Ben Dover]

I reviewed the Youtube graduation video and both teleprompters have one black sandbag each to hold down a tiedown cable. That might be what he is using as an excuse.

[mware]

I thought he tripped over the base of one of the teleprompter.

[1Old Pro]

both teleprompters have one black sandbag each to hold down a tiedown cable

Yep, saw that. He needed to walk a few inches away but apparently isn't capable of looking where he walks.