2
Failure to follow the course of fire
Cover call
The penalty for the failure to engage t4 is the -10 +FTN

The other things you listed (visited the positions out of order, Engaged T2 from the wrong position, Failure to fire the required number of rounds according to the stage procedure) are all the same penalty, failure to follow stage procedure.

I may be wrong. Have been before.

Dave B
IDPA at ASC MD
A32607