कृतप्रयासं हि मध्यमामित्रमपसृतमेकार्थोपगतं प्राप्नोति ॥ कZ_०७.८.२३ ॥
kṛtaprayāsaṃ hi madhyamāmitram apasṛtam ekārthopagataṃ prāpnoti
For the middle king secures an enemy who has already exerted effort, has withdrawn (from elsewhere), and has converged upon a single objective.
A partner/opponent becoming single-issue aligned—useful but also potentially dangerous because focus increases operational effectiveness.