A pair of teachers walked into the offices of the professors of the college of education and their bobs bounced as heels proceeded down the hall. They stopped first at the door of an assistant and opened the door and began their new technique. Instruction. They simultaneously began chanting and waving an index pointer at the assistant who gapes at them as her eyes begin to glow. She takes in the info and magic and returns to work as her hair becomes bobcut like and socks turn dark as her flats gain a bit of heel.
Instruction would allow them to infect people without changing them. Planting a seed that would change everyone they came in contact with.
A minute after they left a male student stopped by and was "instructed" as he left content he felt like his chest was swollen or his undershirt was tighter.