Possible Clues:

• Never come back and rest as one comes back once more
• Soldier enrols and comes back in
• Goes back in to find tenants who have ingested drug
• Types in again
• More than one person sorry to have lost a little money drops in again
• Comes down to Earth, as an astronaut
• Goes back in to find tenants injecting drug
• Energy absorbed by tenants goes back in
• Penetrates, once again
• Joins again, as a race