While Howitzer is OP, I'd say that Wokistan have pretty decent chance at speedblitzing Holden with his car. First of all - currently Holden lacks enhanced senses, so he could potentially be caught off guard by car running at him at full speed outside of his FOW and that most likely would be enough to completely incapacitate him (since car crashes could be scaled above baseline Wall level, while Holden currently scales to Street level skull crushing). Second of all - Wokistan might have some advanced GPS system downloaded on his car (depending on it's model), that tracks not only destination, but other cars and pedestrians, so he potentially could find Judge Holden a bit faster than he does
And no, that's not a vote for anyone, since it's up to you, to consider those advantages as sufficient or not
That's true but again, depends a lot on distance, even if Wokistan can detect Holden faster, Wokistan cannot affect Holden faster than Holden can affect Wokistan (due to range differences, I'm unsure Wokistan could cover the distance with the car before Holden can fire the howitzer) if assuming they both went for open assault, and range still also makes it difficult for ambush capacity for Wokistan since Holden can deploy the howitzer and revolvers faster and can attack from a longer range than Wokistan can with the car or other equipment.
Idk which distance I should choose to make it even, so let's assume that it's closer to range of Holden's revolvers, rather than howitzer and they behind some kind of City block
Wokistan would still need time to accelerate the car to a high enough speed to hit Holden, but by that point the noise would very likely alert Holden before Wokistan has built up enough speed OR covered the necessary distance (unless we're assuming the car is freaking rocket-propelled or jet-propelled or is a general supercar like that of F1 and NASCAR race cars or popularly known extremely fast cars, and even then it'd take a bit of time to go from a complete stop to full speed, so we'd also need to assume the car is capable of extremely high/fast acceleration, which would also make it challenging to rig to aim for Holden without, and that's all assuming Wokistan even OWNS a car like that or is able to modify a car or other weapons and vehicles to cover the distance faster and more accurately AND with more power, all at the same time, than Holden's howitzer and revolvers can).
en.wikipedia.org
At this point Wokistan's best bet is either the car or being able to build a light gas gun or other means of using pressurised stuff to accelerate flammable, sharp and/or blunt stuff towards Holden faster than Holden can with the howitzer and revolvers, but again, unlikely that Wokistan's car is actually in the same league as extremely-high-speed-and-acceleration vehicles or that Wokistan can build and operate such means without alerting Holden or before Holden is alerted.
Also I'm not sure if a city block is open enough to be considered an open area... (We need to confirm how open an "open area" needs to be, either it's open in all dimensions from all angles (like a wide open field with minimal cover and concealment) or it's only open from certain angles (like streets lined with buildings.)
Both sides would also likely give away their positions early even without line of sight (it'd be quite hard to conceal the howitzer and car visibly).
(I'm still not sure how there's no line of sight in an open area, since the open area would also mean that they'd more easily spot each other, unless you mean that they aren't initially aware of each other's positions visually from the start, and even then it'd take a relatively short time for either side to see each other after the match begins, again as mentioned more clarification is necessary on what "no line of sight in open area" means).
