"They would have to be very confident in their abilities, or very stupid. I'd rather bet on the former, and assume they have more firepower than they've shown in the past. How do we plan around more destructive- or more insidious- objects?"

"If it's Objects. They could merely have a gun pointed at us when we come out."

"I suppose that would be an option, yes. If we try a two-pronged approach...I go in with the umbrella while one of you takes the key? More of us at risk, but possibly less so, if we plan it right."  

"We should assume this extra door is guarded and watched, even if I didn't see anyone there."

"We can, but I don't think any other entrances are less defended. What did the front look like?" 

"Large roll-up door, standard issue for this kind of warehouse."

"And I take it the key can't take you through it?"

"It cannot. It's very flexible about what kinds of doors it can open but there is a limit."

"Then we'll have to assume the back door is meant as a trap. Alright, assuming they let the Sheriff through the front, and I use the umbrella to get in from the back, then the back door becomes safe to use with the key."

"How does it?"

"The umbrella is very convincing. I can remove the threat."

"I see."

"And how does that plan fail?"