Whatever you sensed in the alley while talking to the officers it would have had little to do with either assailant or victim who were both long departed by then, albeit in conceptually different ways.
Somehow, you don't think that Persis' men carry sabres- "Only a Jedi carries that sort of weapon..."
Obviously not literally true in this case, but clearly not just going to be some schmuck.
The Gran was also either extremely stupid or he was killed before he realised what was happening (i.e. his sword would be no good in that fight). The latter being more likely, the assailant must also have the the speed of a Jedi.
Quam opens his bag and holds up the Sith tablet he had retrieved for himself in the cave. "As a freelancer, I'm always on the look out for a good deal." He slowly sat himself down, noticing that Ascar's eyes glinted only for a fraction of time, but enough to be noticed by Quam. "And in my experience good deals are never made in a hurry. Nor in a bad mood..." Quam produced the most mushy smile, revealing perhaps for the first time his grey pointy teeth to anyone.
Ascar takes a look at the tablet, placing his hand to its back, causing the hidden Sith hieroglyphics to glow.
"Ah," he says. "They do say that those versed in the power of the Dark Side could focus their hate into power so tangible they could strike their enemies down... but who really knows what secrets the Sith knew of their so-called 'Dark' Side, hmm? Do you believe in such legends, Mr. Ak-Toh?"