Typically, roleplaying etiquette implies you only control your own characters actions, and not the actions of others, unless you're the GM. In smaller or more familiar groups- or when explicitly allowed, some degree of actions can be assumed for other members of the group. But in general, just like in real life, you cannot control what others say, think or do. That usually takes away the sense of agency for others, and may interfere with what their plans were for their character. Just some stuff to keep in mind for the future.