Closest I got with randoms to beating Terrorist Hunt on realistic was 7 enemies left
I died right off the bat cause apparently you're not safe on the roof with Twith
Couple Hunt tips: Two bombers are always in the level when you start. On realistic there might even be three (this is hard to determine for reasons I can't get into atm) but always at minimum two at the beginning. Once you kill those two, more guys will spawn outside. 4-6 depending on difficulty. And they'll immediately attack any operator still outside. This is why teams who rush right in can get cautious players killed. Might be on your drone, and those first two bomber kills can happen right off the bat, causing the annoying spaw outside before you're ready. Anyway, continuing, at a certain point, usually nearing the last third of the round, another bomber spawns. In classic Hunt, you fight 3 bombers on hard, and 4 on realistic. On hostage rescue, it's very similar to classic, except a bomber and number of guys spawns outside at the extract when you touch the hostage.
Hunt on realistic isn't too bad, as long as you manage the bombers, knowing where and when to expect them. On hard or above, I don't play defuse or protect, as I believe those modes are broken on higher difficulties.