My brother is being stubborn and refusing my help after days of making me do all the work, should I help anyways?

Me and my older brother are on a camping trip together, it's something our parents make us do every year. Sometimes it's fun, other times it's a chore. This trip so far has been more of a chore as my brother is making me do all the hard labor (carrying bags, cooking, setting up the tent.) What doesn't help matters is the awful weather. It's absolutely freezing, especially during the dark. To help with this, we've got these big puffy sleepingbags to keep us warm during the night. Last night we found out that the only way to zip them up fully is to have someone do it from the outside, my brother made me zip his up which ment I couldn't have mine zipped up and I spent all night cold. Now it's morning and it turns out the only way to get out of the sleepingbag is to have someone unzip it from the outside. So my brother is stuck in his sleepingbag which-

1. He blames me for.

2. He insists he can get out of without my help.

I've basically spent all morning watching him wriggle around and refuse my help. I don't understand how all through the trip he's made me do everything, but now is determined to get out on his own. I'm on my phone and figured I'd ask what you would do.

Also, he won't shut up blaming me for it (even though it was his own fault) so any suggestions on keeping him quiet is welcomed.

My brother is being stubborn and refusing my help after days of making me do all the work, should I help anyways?
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