He was moving too swiftly for a man acting from impulse.
Sefka looked like he could move pretty fast for a big man.
The large biker came forward, moving quickly for such a heavy man.
Kelly moved quickly for a man of his size, and silently.
Zworykin moved quickly for a big man and reached it first.
He left his chair, moving quickly for such a large man.
He moved with amazing speed for a man of his age.
He moved very quickly for a man so old.
He can also move deceptively quickly and efficiently for a man of his size.
He moved surprisingly fast for a man of his bulk.