You've already answered your own question..
To scare her into making a bad move and revealing her location.

 

Breaking the glass was so he could hear her walking around.

 

What everyone above said. But also, he was torturing her, basically. She won't be able to hear whistling again without freaking out.

At that point he didn't have her physically, so he was inflicting mental pain. Sound is strongly tied to memory. Imagine being Andrea a month from now at the prison, and suddenly Hershel starts whistling. She'd fall apart. I grew up with an abusive dad, and he used to bang on our windows all the time. To this day, the sound of someone knocking on a window sends me into panic mode. He was making sure he inflicted as much pain as possible, and used sound to do so.

 

Yeah, plus he likes to whistle.

 

Hmm I think he smashed the windows out of frustration. He wanted Andrea to go back with him.

 

I once had a pet small dog a long time ago that escaped by running through my legs when I opened up my front door to let someone in. I never got him spaded and he was in heat. I chased him down the street and he just kept on running. Then he stopped for a while and when I got somewhat close to him he ran up a little bit more and just looked at me. When he did that i got so mad and yelled "I'm going to beat your ass when you come home later" and I threw his leash to the ground with all my might and then he wagged his tail and ran away. I walked home so angry that day. He had done that a couple of times before so I wasn't worried about him not coming home. Later on when he came home I was so happy that he came back I forgot about how much he pissed me off.

I felt like telling that story because when the gov smashed the windows it reminded me of when I threw the leash on the floor. I actually laughed at that scene and my GF looked at me with a puzzled face like WTF. Lol

 

If your gonna act like a dog you will get treated like a dog.
Personally, his whistling had me in tears from laughter because it was like him calling to some lost dog who ran away.
It amazed me that Andrea was so cocky to just walk away from it like...she won or something like that..*bleh*
But it's all good...he caught his chew toy outside the prison

 

*Just stares at...I mean really just gives a look that could kill*

 

I think there could be a little more to the whistling than just creeping Andrea out...He was doing the same whistling and playing it back when they were spying on him in his "workshop".

 

i wonder why he recorded it.

 

I believe he was just testing how well the tape recorder worked from that distance. He must be planning on recording the screams and cranking it to it or something.

 

*Glares*

 

Hey I'm just saying, there is no more internet, you know? Philip seems to be into some weird stuff. :zombies_lol:

 

I will wreck your world....I will have you know that Philip enjoys...
Errr...
*glares*
I won't let you win.

 

He was doing all kinds of psycho stuff to freak Andrea out. Not that she shouldn't have been already totally creeped out. He had zombie heads in fishtanks! If he were a scientist it _might_ have been normal behavior .. but I bet he was something like an accountant or a janitor pre-ZA. Some kind of job where he had no power and was always frustrated. Then he lost his wife, his kid and his world. He crumbled into the pathetic tyrant we see on the show.

 

I agree with soem of the other responses regarding his behaviour/tactics to freak out Andrea and drive he into the open but

was it a particular song/tune that anyone recognised?

Is there any link to anything he's whistled/hummed/sung before?

 

Zelda's Lullaby.

I'm sure it is on YouTube. I'm on my phone and links are a PITA.