What’s he supposed to do?say no? If he doesn’t take it then they will kill him and make Noah take it then rape Noah and if Noah took it he would most likely die. It’s a lose lose situation he chose the option that has the highest chance of keeping Noah safe and chose to get raped so Noah doesn’t have to, he’s trying his best
the thing i will say will sound so fucking selfish and controversial but here goes nothing (im botta get canceled lmao)
He can “distract” him doing things the man wants. The man seems like he will rape someone (spoiler: also heard this one in the comments) no matter the condition. So being aware of your surroundings at all costs makes it more advantageous and logical
They may be kidnappers but they aren't dumb, eventually or maybe even immediately they'll notice that Jace is trying to distract them from eating that thing. The options are that Jace eats it and gets r-ped OR Noah, pretty sure which option is better is obvious. UNLESS the author really does make them dumb then I have nothing to say.

How do you think thats a good idea. If youre knocked out cold HOW ARE YOU GONNA PROTECT NOAH. THAT SON OF A BITCH MIGHT REALY RAPE HIM YOU NEED TO STAY CONSCIOUS