Why would they write instructions like these in english?
The terrorists come from many different language sources. Chechens, Egyptians, Pakis, Lebanese. English is the common denominator even if it is broken English
I considered that. In verbal communications yes, but still hard to believe they would use it for written instructions. The one consideration that would make it more plausable is that these instructions were meant for infiltrators. I guess they would have to have at least a rudimentary knowledge of english.