catch someone in the very act of doing something

be geared up for bonds in series critical relative molecular mass dysgenic milk follow block fork expander bolt give one's heart to heavy wall drill pipe hot-blast heater laetacara line up alongside sb momentarily comoving reference frame (mcrf) nonmonotonic palpebral furrow prototype edition rains pitchforks shutoff silk-stocking stenosis of lacrimal passage yttrium-90 rod