He was released from hospital Saturday afternoon.
"He walked in and he just had a gun in his hand and he was, just started waving it around and he took about 4 to 5 maybe 6 shots", said another student who asked to remain anonymous.
President Donald Trump went on Twitter on Saturday to thank Seaman "for his heroic act in saving so many precious young lives".
A teacher was praised as a hero on Friday after taking quick action to subdue a student shooter in his classroom.
Vice President and former Governor of Indiana Mike Pence tweeted "Karen and I are praying for the victims of the bad shooting in Indiana".
"I believe it was probably very instinctual with him".
"I didn't cry", he said, "but a lot of people were crying". He said he was conscious after the shooting and talked with his wife, telling her he was OK. However, hospital officials said at least three people, including one adult, were being treated. "He always said that he was willing to sacrifice himself before he was willing to let anything happen to his students".
"We were all hiding in the back of a classroom behind some desks, then [Seaman] was yelling to call 911, to get out of the building as fast as we could", the student told WTTV.
Shooting Reported at Indiana Middle School, Two Injured, Suspect in Custody
"If it weren't for him, more of us would have been injured for sure", said seventh-grader Ethan Stonebraker, according to the Associated Press.
Authorities did not release the name of the suspect or the wounded student.
Authorities said a male student was detained.
Police said Friday night that the suspect did not appear to be injured. He described him as "a nice kid most of the times" and said he often joked with the classmates. "He's in all my classes and it's just a shock that he would do something like that". Sandy McWilliams, a member of a landscaping crew working nearby, said six officers toting assault rifles entered a home.
Students were bused to Noblesville High School gym, where their families could retrieve them. "You'll be proud of them, too".
Ms Higgins said her son was shaken up but knew little about what happened. Jowitt said that classroom is where the shooting occurred and that the incident was resolved quickly.
The goal is to "repay a deed that can not be repaid", Ramsey said.
The shooting comes a week after 10 people were killed at a school in Santa Fe, Texas.
"Legislators must admit and take seriously that we have to keep guns out of our schools, and restrict access to deadly weapons by risky individuals".
Indianapolis 500: Danica Patrick crashes out in final race of her career
The mood was much different for Danica Patrick as her final Indy 500 ended on the 68th lap when she crashed her vehicle in Turn 2. He was then tagged by 2017 victor Takuma Sato while getting back up to speed from a moment on lap 46 and retired.