I thought you cant attack a guard in 100% suppression gas area... Am i wrong ? So why do you want to heal them in these circumstances ? Or even to lose token. If an omni enters in a clan city, he will be attacked, so his fight will be legitimate for his self-defense. If he survives, you would like to penalize him with a token or more ? I disagree with that.
Note i'm a clanner, and i will support the omni in this example.