He's creating a junction.
3 seconds sound clip from the TRON (1982) movie soundboard.
You can hear this line at 01:15:46 in the Blu-ray version of the movie.
Quote context
[...]
- We have to get off this beam.
- I can't. There isn't another junction for seven or eight nanoseconds.
- Yeah.
- No, but I couldn't tell you why not.
[...]