Why do mosquitos feel they have to resort to guerrilla tactics?

So last night, just as I was about to go to sleep, I heard a buzzing sound. Having spent several years honing my skills in combat thanks to watching various kung fu movies growing up, I was quickly able to pinpoint the perpetrator. I could only lament the lack of chopsticks at hand (shout-out to Sam Sneed). Anyway, I used a special technique and thought I killed said mosquito with my bare hands. Am I the Revenant? Anyway, I went to sleep, happy that I had baffled to the death and won. Only when I woke up, there was a spot on my buttock that was itching. I quickly pulled back the cover and may or may not have done a spin to get out of bed... Parkour! I attempted to call for medical attention, but my cats think they're vampires and I'm writing this story on Lemmy, so I'm clearly single. But duty called and so I got on with my day. However that evening, I was getting changed to go to the shop when, the mosquito that had feigned its death and hid under the blanket until I fell asleep so it could take a bite out of my bum, decided to try and take a bite out of my cheek. I rolled past its jab and then shoulder threw it into the wall before giving it a dragon punch (to the untrained eye it looked like I chased it and luckily slapped it against the wall) and then proceeded to think the blood looked gross. But yeah, why are mosquitos like this now? Their old method was so effective, I just don't get it.