Tannusen moved very fast indeed... and he didn't stop moving that fast! This was no burst of desperation, no surge of adrenaline that would burn away as quick as it hit. This was just how he moved, when he wasn't playing along with a flailing human's attempts to bat him away like a naughty house cat.

He rolled up onto his target, straddling him and putting all of his weight onto Cassian's stomach. Then he aimed one hell of a punch for his face!