When using armor accessories with a "+" there is a paragraph on page 169 that states:
Armor accessories, items listed with a “+” in front of their rating, add to the character’s Armor for the purpose of Damage Resistance tests. The maximum bonus a character receive from these items is limited to their Strength attribute. For every 2 full points by which the bonus exceeds the character’s Strength, the character suffers a –1 penalty to Agility and Reaction.
Assume now a character with STR 1 and AGI 3, REA 1. If he is using any item with +3 or +4 armor rating, his attributes would drop to AGI 2, REA 0.
Is this valid? What are the effects of REA or AGI 0 (or even negative when the armor rating is higher)?
Does it have any effects on derived values like initiative (REA+INT+1d6) and defense (REA+INT)?
When asking the question on reddit, a user supplied the description of the spell "Decrease Attribute", which states
If a Physical Attribute is reduced to 0, the victim is incapacitated and paralyzed. If a Mental Attribute is reduced to 0, the victim stands still, mindlessly confused.
But even if that would be generally valid and not just for the spell, it does not address what happens to the initiative, or what happens with negative values.
Ps.: I cross checked the German translation and it is no clearer there.