Depending on age your rifle may not have the cocking indicator like his probably does. The cocking indicator, on newer models, pokes through the 1/4" hex hole in the BAS at the rear of the bolt. This could prevent an allen wrench from seating in the BAS unless the bolt is uncocked.
If his does have the cocking indicator all he needs to do is uncock the bolt then disassemble as normal.
I would be more interested in why he is checking the headspace on a new firearm. If it is new and has a problem I would be more inclined to contact Savage about the repair than try to diagnose and fix it yourself.
Dolomite
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