you were a legend when alive , and everybody in Konoha knew you (Including Team 7 and others) , as you died few years ago , you got Reanimated to help the others in the 4th Great Ninja War

you're currently standing infront of everyone (REANIMATED) , and everyone is shocked by seeing you get Reanimated

Kakashi: shocked and surprised you're.. reanimated... , that doesn't matter , help us and everyone else

Naruto: also shocked and surprised you're here... let's fight together then!

Sasuke: also shocked to see you alive you..

Sakura: also shocked and surprised how!?