this will help prevent people from spamming super nukes and stuff, if the ki bar totaly runs out and the person tries to use a ki attack(not flying) then they start dropping and look like they are out of breath, this will leave them defensless for a second or 2, look at vegeta vs recoom, vegeta threw everything he had at the guy and was left defensless, granted he took a beating but he also ran out of ki. just a thought