rom 2017.2
4.8 Threat and Non-Threat Target Designation
4.8.1 Non-threat targets must be designated by displaying a pair of normal sized open hands of contrasting color, at least one of which must be visible from all shooting positions where the target may be engaged.
4.8.2 Threat targets may be designated by displaying a normal sized threat indicator (like a firearm or knife) that is visible from all shooting positions where the target may be engaged.
4.8.3 Targets must be easily identified as threat or non-threat.
4.8.4 Threat indicators of different kinds all have equal threat value and do not change target engagement priority. For example, a knife is equal in threat to a shotgun, rifle, or other firearms.
4.8.5 Threat and non-threat indicators may be painted or marked on the targets or covering clothing, or may be clipped or stapled to the target.
From 2015
4.11 Threat and Non-Threat Target Designation
4.11.1 Non-threat targets must be designated by displaying a pair of normal sized open hands of contrasting color, at least one of which must be visible from all shooting positions where the target may be shot.
4.11.2 Threat targets may be designated by displaying a normal sized threat indicator, like a firearm or knife that is visible from all shooting positions where the target may be shot. Threat target designation is not mandatory, but is highly recommended. In no case should a threat indicator and a hand be positioned on the same target. Threats indicators cannot look similar to non-threat hands. Targets must be easily identified as threat or non-threat.
4.11.3 Threats indicators of different kinds all have equal threat value and do not change target engagement priority. That is, a knife is equal in threat to a shotgun, rifle, or other firearms.
4.11.4 Threat and non-threat indicators may be painted or marked on the targets or covering clothing, or may be clipped or stapled to the target.
Nothing stating that the threat indicator is hard cover.
Were you given a miss for hitting a threat indicator?