A sharp intake of breath.
Ryuutaro didn't run there though. He knew that would be stupid. He knew this could all be one giant trap and running in there headlessly could end up in a disaster.
His first steps were slow and wary, but when nothing happened they fastened up until he could kneel down next to Hayato, anxiously turning him around.

The how maniest time was this for him to look at an injured Hayato? He couldn't tell anymore, but it didn't get better the more it happened.
Everytime he could feel his heart hammer against his chest, his body getting cold.
He was scared. Every single time.