Via email from Sean who says
How Not To Do Boomershoot
Huffman’s first rule of recreational explosives:
Never put anything between you and explosives which a surgeon might be required to remove from your body.
Note that this guy didn’t move out of the way until after the debris hit the tree. This is typical. Even from very small charges, unless you are hundreds of yards away you won’t have time to move before impact.
Also from Sean is another example.