There are several synonyms for the phrase "summoned back," including "called back," "recalled," "retrieved," and "sent for." Each of these phrases implies the idea of bringing someone or something back to an original location or situation. "Called back" is perhaps the most straightforward of these synonyms, indicating an active act of summoning someone to come back. "Recalled" has a similar connotation but might imply more urgency or importance. "Retrieved" is a bit more passive, suggesting that something or someone was brought back from a distance or from an unexpected place. "Sent for" is another option and implies that someone was requested or ordered to return. Regardless of which synonym is used, the overall sense of returning or recalling something or someone remains the same.