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I've managed to "control" a strider in so far as I can set it's cannon target to attack an npc using a very simple script ("ent_setname about_to_die; ent_fire pet_strider setcannontarget about_to_die")
this is cool but what I want is to direct a strider to destroy a certain bit of scenery (i.e. a wall) so that I can create a map where a strider will allow a player through to the next section. I'm quite happy to do this in code, but if it's possible by just mapping that'd also be cool.