engine/

Player::GetShieldBlockValue (Player.cpp:5426-5430) folds gear/enchant block value (state.Block, fed by HandleBaseModFlatValue(SHIELD_BLOCK_VALUE) for ITEM_MOD_BLOCK_VALUE, Player.cpp:7682-7683, proto->Block :7731, and enchantments :14217-14218) together with the 158 flat leg (AuraEffect::HandleShieldBlockValue, SpellAuraEffects.cpp:4212: plain HandleBaseModFlatValue add, player-only) and the strength term, then applies the 150 pct leg (AuraEffect::HandleShieldBlockValuePercent, SpellAuraEffects.cpp:4224: multiplicative ApplyBaseModPctValue on the base-pct mod, whose remove leg re-sets GetTotalAuraMultiplier over the remaining auras — identical to a live product fold).