OP, it looks like you were in violation of the strict letter of the ordinance, and the title of your post says it all. Officer discretion failed.
If you weren't at risk of having a violation of the Carmel ordinance being used against you some time in the future, it might be worth it to just pay the fine, and move on.
HOWEVER, it think it's important that you go to the hearing and MAKE A RECORD of what happened, and then order a transcript of the proceedings, just in case the violation doesn't get thrown out.
In the future, if you have to use deadly force, you don't want this ordinance violation to be brought up to muddy the waters.
If you weren't at risk of having a violation of the Carmel ordinance being used against you some time in the future, it might be worth it to just pay the fine, and move on.
HOWEVER, it think it's important that you go to the hearing and MAKE A RECORD of what happened, and then order a transcript of the proceedings, just in case the violation doesn't get thrown out.
In the future, if you have to use deadly force, you don't want this ordinance violation to be brought up to muddy the waters.