Triggers check what entities can trigger them through their flags; normally, only flag 1 (players) is checked. If you want to enable other entities to activate a trigger, check the box of the flag corresponding to that entity (or check flag 64 to allow all entities). You can also filter which entities can activate a given trigger by using filters. (Both of these pertain to multiple types of triggers, including trigger_multiple and trigger_hurt, among others)https://developer.valvesoftware.com/wiki/Filter_Applications
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