Technically speaking huggers will auto-hug humans provided they are in within 1 tile of the hugger, otherwise the human will just be stunned for a short duration. Like sietchi said most huggers get hugs on their own by hiding underneath objects and waiting for a marine to pass it which usually leaves the marine with little reaction time. I’ve seen some huggers just run up to an SSD/Crit/AFK marine and hug them without hiding however that requires some luck.
On someone who’s not afk? On someone who is armed and actively paying attention? Reliably? Only by camping acid traps, though this may count as ‘help’ in your definition. Otherwise never.
Either ambush a clueless marine using hide ability (very funny, once I hugged an invis scout this way), or go for incapacitated marines (those being revived are perfect targets).
How do you ambush a marine then who isn’t lying down? Some people say they can ambush marines at doors but I figured that’d be hard to do if they aren’t laying down considering the facehugger stun is about a second long.
Just use leap ability if they are not lying. If used point-blank (i.e. target is adjacent), you will hug the marine after a short wind-up (granted they didn’t move away). Also you need to target the sprite with the leap ability.
Most do things like, they will use the hide function under a door that needs hacked and when the engie is in the menus you strike, same with defibs on a lone medic. Lying under an IOs needed loot “although i dislike this as a lil meta unless he’s actively beeping his lil beeper”. If you push boxes around to area like a door marines gotta open then you pounce onto the box you will land on top and can hide under it thats a funny hug always. Patience, creativity, timing and luck. Or you can be a sweaty metagamer and try cover your back.
My favorite hiding spot is under plasteel cades (north facing ones). Noone ever expects it, and it’s always an easy hug when it works. Especially so when it’s unfinished cadelines at hydro (very common for some reason)
getting some friendly fire in is also a good way if you fail your hug
another fun thing to do is leap over a single tile of fire, land on some medic across the field and then explode acid directly on top of them due to you dying almost immediately to fire
i hugged a competent SL in the middle of a medical fight once by carefully timing my hiding, didnt need anyone else’s help or any other stuns, so it is definitely possible