Instinctively hands came up from the arms of his wheelchair and prepared to be toppled on. Charles wasn't upset in the least and it happened often enough that it simply became a hazard to being paraplegic.

After making sure the man was on his feet again solidly, he offered a smile.

"No apologies necessary. I'm a bit short and not always easy to see." he answered, making light of the almost accident with a bit of a chuckle.