Ok, then this is still in the investigation stage and they are just taking statements to determine if charges should even be filed at all. Since they are obviously in no big rush to charge him with something, he shouldn't be too worried about it right now.
Unless the DA decides that there was some type of intentional conduct on the part of son, then he wouldn't be able to prove assault as it requires an "intentional act". So if this was horseplay that got out of hand, then there was not the requisite intent necessary to commit a crime.
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