If an enemy unit performs an ARO with a template weapon, does moving into base contact with that model along the axis of the template cancel the shot due to friendly fire?
Short answer: it does not. There are multiple examples in the book that show it's legal to walk into base contact within the same order that a template attack is used.
The main rule here is that you cannot be affected by your own template. I assume we are talking about direct templates, and without the aforementioned rule, they wouldn't work at all because they must be in contact with the attacker's base.
Is that really the explanation? Because if that was the case mines wouldn't go of if i walk into btb with an enemy inside of the trigger area of a mine.
A trooper can't be affected by their own template. Which is what lets you chain rifle an enemy moving into b2b with you. A Mine's template can usually be placed to hit an enemy before they reach b2b, so it wouldn't be attacking an engaged target.
It is possible, though somewhat hard, to enter base contact with an enemy and have a nearby mine not blow up in your face: if the only time the mine could hit you is when you are b2b. Imagine this scenario: a Rodok drops a mine behind him next to a building and he's facing a corner ~1" away. In the enemy turn, a trooper comes up around that corner and enters B2B with the Rodok. As long as the enemy is S2, there is no way the mine can go off without hitting the Rodok, so it doesn't. However, if the mine is, instead, placed to the Rodok's side, then the mine can (and does) go off before the enemy enters B2B.
I still don't see why i need the rule that templates do not affect the owner (besides the obvious thing that it is placed in contact with him) for any of these btb interactions. If this is a thing shouldn't it suffice to explain the other stuff as well? Yeah this is hard to pull off. If this ever happens in one of my games i'll drink to you.
My point with my first post was that in the absence of any other rules, that one would still allow the template to go down with no problem. Sorry if that wasn't clear.
Mind the template is there for the entire order. The enemy model moves and enter in b2b with the Rodok; it'll go off only if the mine can place the template in any point of his movement in a way that it won't cover the enemy model engaged with the Rodok at the end of the movement. Without this rule You could negate a chain rifle ARO going in B2B with that model (you enter in b2b, the template now damage both, one of them being an allied, ARO canceled)
Please note that the rules for template weapons not affecting the shooter only applies to Direct Template Weapons and not to Impact Template Weapons. There is an example which says otherwise so your interpretation of the situation is going to be different depending on if you consider examples to be rules or just illustrative. It's under Impersonation. Because of course it is. That's where it's easy to find.
There's a gameplay example of a Fiday moving into base contact with a Fusilier in the same order it shoots it with a shotgun (impact template weapon). It's on the Impersonation page, however this particular interaction is not based on requiring the IMP state. http://infinitythewiki.com/en/Impersonation#Example_of_Impersonation_and_base_to_base_contact In his Active Turn, a Hassassin Fiday in the Impersonation-1 Marker (IMP-1) state declares the first Short Skill of his Order: Moving into base to base contact with an enemy Fusilier. Since he ends his Movement in base to base contact, the Fiday reveals himself automatically: he loses his Impersonation-1 Marker state and the Marker is replaced by his figure. Remember that, as a rule, all events that take place during an Order are simultaneous. This means that by entering base to base contact at the end of his Movement, the Fiday is revealed and acts as a figure during his entire Movement route. The Impersonation-1 Marker (IMP-1) is replaced by the Fiday model the moment he declares his Movement, and this affects possible AROs. [...] The Fiday declares BS Attack. Imagine there is one other enemy with LoF to the Fiday besides the target Fusilier. In that circumstance, the Fiday declares a BS Attack as his second Short Skill, distributing his Light Shotgun's B 2 between his two foes. In this scenario, there are two Face to Face Rolls between the active trooper's BS and the appropriate Attributes of his two enemies. If the Fusilier declares CC Attack, his CC Attribute is pitted against the Fiday's BS. Like in the previous case, if that Fusilier declares Dodge and wins the ensuing Face to Face Roll, the two figures enter base to base contact briefly but the Fusilier gets to move as per his Dodge ARO, and ends the Order away from the Fiday figure.
