The skill Spear Bolt DOES apply +16 AP, but the skill Flow: Aftershock does not apply +16 AP even though it is written that "All AP +16 for 10 sec. upon using skills."
How to see this skill does not apply +16AP:
1) Use Shock Relay (RMB)
2) Use Flow: Aftershock (up+F).
3) Look at the buff bar and see there's no +16 AP for 10 sec.