WI Emperor Leo V kills Krum of Bulgaria in 813 AD?

In 813 Krum of Bulgaria blockade Constantinople by land. New Emperor Leo V offered to negotiate in person with the invader and attempted to have him killed in an ambush. The stratagem failed, and although Krum abandoned his siege of the capital, he captured and depopulated Adrianople and Arkadioupolis.
WI Leo V was successfull in assassinating Krum and his Generals in this ambush?
How is this altering History? Any thoughts?
 
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