User blog comment:G0LD3NF1RE/Skyrim Dawnguard DLC/@comment-5074828-20120503234147/@comment-174.114.71.116-20120506141803

rossko is right when he says theyre def not bolts. bolts dont have fletchings/flights on them like arrows. but the thing is there have been many crossbows that have fired arrows instead of bolts so these could andf prob do signify the introduction of the crossbow.