At some point during the battle between Qui-Gon and Darth Maul, then enter a corridor. Obi-Wan follows them, but is separated from them by some kind of laser gates.
Qui-Gon and Darth Maul reach partway through the corridor while they are dueling, only travelling at a speed of someone walking. When the gates open, Obi-Wan rushes to join the battle, as fast as he can. But even then he can't reach Qui-Gon and Darth Maul before the gates close again.
Why wasn't a running Obi-Wan able to cover a greater distance than what Qui-Gon and Darth Maul managed to cover whilst fighting?