He can do a lot in this situation. Maybe swarm them with with bird familiars, blind them with fog, rain fire and lightning down on them, he even thought of dropping the building on them. This was the problem he saw with ViViD, it gave him too much freedom to do what he wanted. To cut lose and raise hell, let the old demons run wild.

Once. He did that once, and it will never happen again.

For now he played by the rules he knows, grabbing Nanoha's hand and leading her back the way they came. Once out in the street, he spots exactly what he was looking for, a parked car across the alley. "Keep an eye out, tell me if any of them come this way." Making his way to the car, he breaks open the cover of the gas cap, removing it. After, he goes into a nearby boutique store and brought with him a scarf, which he shoves into the gas, and other clothes. With his back turned to Nanoha he cast a simple spell to ignite the scarf and ran back to her with the other clothes in tow, grabbing her hand and dragging her back to the alley then pulling her down to crouch down next to the dumpster then throwing the clothes to cover them.

"Cover your ears." A few minutes pass, then eventually a deafening explosion goes off, catching the attention of the aliens who rush over there, ignoring them in the process. He peeks out of their cover and pulls her again, running swiftly across the street and into the next alley.

"That is the only time I'll be able to do that. One more and they might just pick up our trail."