specify guarding cost

combat.tex

@@ -652,6 +652,7 @@ A successful roll implies the character can break the grapple and move freely, o
 If you guard someone by standing in front of them then all attacks have to go through you first.\footnote{This includes missile attacks only if you could otherwise evade them.}  Any enemy making a successful attack on you can choose to damage you, or to make another roll (as a free action, costing no Initiative) at their real target.
 
 Guarding costs 4 Initiative, as the character must both focus on helping a companion and focus on their own defence.
+To put it another way, guarding someone costs 2 Initiative, and defence costs 2 Initiative as normal.
 
 \subsubsection{Half Swording}\index{Combat!Half Swording}