It's difficult to explain but I think the dialogue is a little bit less natural than in the main game.
I'm really not sure myself. Basically it went like this: both the NCR troopers and Veronica had been attacking "something" outside of the Warehouse, I ignored it and entered, went to Tap-trap and talked to him (I think I noticed some Fiends stirred up inside but they didn't look hostile to me so I ignored them) then immediately after I talked to him and convinced him to let the hostage go... I couldn't even "talk" to the hostage because they all attacked me and he was trying to escape. Reloading to the save before I entered the warehouse worked, weirdly enough.
Also, the quest states look a little buggy too, though I dunno if they're intended to work like that. My main objective remained "Investigate the warehouse and talk to Ranger Tap-Trap" throughout all the quest.
Interesting. Are you planning to release a Quest pack or something like that? In all honesty, I've never been that interested in quest mods myself, but I guess I can give them a try if you keep the quality level consistent and they're short/non intrusive like this one.