The spider usually doesn't attack unless you are close by. When it does, you have ample time to move out of the way before you get hit with the bite. Very easy to defeat, even when swarmed since they have a very low attack rate, but be wary since the higher levels could spit a spider web that doesn't only damage but is also ranged and doesn't let the player move. This can be deadly if swarmed.
Usually a spider at the lower levels just attack with the slow bite, but for the spider with the higher levels, they can spit out a spider web that does not let Kimura or the player move for about 5 seconds.