Reinforcing after timer runs out. Impossible? Maybe not.

Maybe not a ground shattering revelation, but I've figured out that if you input the code for a reinforce before the mission timer runs out and hold the beacon in your hand without throwing it, the reinforce will still work. We've taken to having one guy call the beacon and stay out of the fight until Pelican-1 is about to arrive and then throwing the beacon to call back in anyone who has died after the timer ran out.