An Israeli source earlier assessed that Iran's response to the American strikes on its territory would be "limited, contained and symbolic only" - mainly to signal a response without leading to wider escalation, and so far it seems that the Iranian attack matches these definitions. The source estimated that Iran would attack a base that was evacuated in advance to allow for a measured conclusion of the event, and it's possible that the Americans might choose not to respond at all or transfer the responsibility for a response to Israel.