Maybe he just hated tourists with their intrusive gadgets? Clearly the evidence of her murder could not be recorded on them.So, I think almost all of us come to agree that in those devices there was some kind of an evidence which had to be destroyed.
How did SS happen to take his picture i wonder, did she ask if she could? was that what 'the hand signals' were about?
It seems a bit improbable that after the attack started she quickly shot a picture of her attacker, but just maybe she did.