In SL there are many ways to create new things. In this exercise Austin was trying to make a voice operated cannon that would rotate and elevate when given appropriate instructions. The idea was to make this an interactive tool for demonstrating rotations, quaternions and vectors for students to play with. BUT even something as simple as adapting a standard Linden script and putting a few things together requires a little bit of concentration.
So for all you yet to experience this – don’t make an object ‘physical’ then decide that you want to move a part of it and so unlink it. What happens is that all the objects that were happily intersecting each other decide that they now need their own space – BANG! We found bits of cannon on the roof of the Anglia Ruskin Building 
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The really sad bit is that he didn’t have an up to date copy before the explosion … sigh! Remember folks, there is no ctl-Z in Second Life
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