Pg 145
"The only way to affect an Initiative Score during the Combat Turn is with wound modifiers."
Pg 145 (three paragraphs down)
"If a character’s Initiative attribute changes, immediately apply the difference as a positive or negative modifier to the character’s Initiative Score. This new Initiative Score applies for any subsequent actions in that Combat Turn. So a character with Initiative 8 and an Initiative Score 11 who activates an implant that changes his Initiative to 10 (+2) immediately raises his Initiative Score to 13 (11 + 2)."
Not earthshattering but it threw us a few minutes of confusion, anger and fear.