Sam took Allison to the car and put her in the backseat then went back to look for Dean

Sam: DEAN!
Dean: SAM over here!

Sam followed dean's voice until he finally reached him

Sam: where is it
Dean: I don't know how's Allison
Sam: fine the windigo knocked her out so I took her to the car
Dean: ok let's find this bitch and kick its ass
Sam: yeah

While Sam and Dean were walking the windigo came up to them then the boys killed it with fire then they went back to the car.

Dean: let's go before anyone finds that thing
Sam: what about Allison
Dean: what about her
Sam: we can't really take her with us
Dean: let's take her back to the apartment