You are looking for the condition 'Has exit time' which you can find by selecting the transition arrow, above 'Settings'. Enable this, and ensure the exit time float inside 'Settings' is set to a number close to 1. 1 means it will fully complete the 'Unsighting' animation, 0.9 means is completes is 90% and starts blending into sprint for the last 10% of the animation.
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