Tristan agrees with Nin's case and defers to their expertise and judgement. However we find the thing, now, will be done without dissent. 

I'll also leave it up to Nin's judgement whether Tristan takes his polearm or not: It's big, cumbersome, and it shouldn't be needed for an exploratory mission. He'll have his much lighter knife and bow either way. It's Nin's decision on whether they are planning for a fight, or planning to avoid it.