Pretty accurate however Rem can deal with a hit and run strat due to her instinctive reactions, which i think would further put him on guard but its still questionable if he would be able to survive long enough after that fails
Her instinctive reaction's are admittedly problematic, but Tartaglia is capable of some larger scale AOE attack's if needed, which might help potentially overwhelm her even considering that (Though this is a maybe, mainly dependent on if she would be fast enough to escape some of the larger scale attack's). Are there any scans directly involving her Instinctive Reactions? Since her profile only say's she's more skilled than someone and I don't see any actual scans on the Reaction's in practice, it'd be nice to have for reference.
It's an infrequent choice for her, it takes a good number of seconds, and is very short-range, less than a meter from her hands.
Then it's probably best to write off the Sleep Manip, since it's unlikely to be used here, and even if it was, Tartaglia tends to keep out of that short a range.
Rem's main advantages will be her insane stamina, her regen, superior power, & seemingly superior combat skill.
Her stamina is pretty impressive (Mainly her tolerance for pain), and her Regen and superior AP will be a issue. But I question her having Superior combat skill. Looking at her Profile, it merely say's she's naturally suited for combat, while also claiming she's a weaker member of her race, anyways. She isn't even granted a proper intelligence rating.
Tartaglia, on the other hand, has the rating of being a Genius Combatant, having been able to master all weapons except the Bow at a early age, and overwhelming trained and armored soldier's with relative ease at only 14 years old. Not to mention that he displayed blatantly superior skill over the Traveler, who has a unquantifiably immense amount of experience from traveling between world's and likely coming into numerous combative situation's. Tartaglia is also renowned for being a tactician and a strategist, and it's in character for him to switch between a Bow and Bladed Weapon's on the fly, comfortably slipping into using the other weapon without any perceived difficulty.
Judging by all this on their profile's, Tartaglia should be considerably more skilled. Ram is only really stated to be a below average member of a combat oriented race, while Tartaglia is out here mastering weapon's and taking on Grown Trained men in Armor at the age of 14.
From what I can see, Rem's Advantages are her Stamina, Regen, Better AP and Durability, Instinctive Reaction, and Better Range.
Tartaglia has a great advantage in Mobility, has Paralysis, and has a massive advantage in Skill judging from what the profile's here say. And while not at the same level as Rem's, his stamina is nothing to scoff at either.
Another advantage that is something to consider, though not likely to apply here, is Tartaglia's Possibly Class K Lifting strength, compared to Rem's class 5.