RETURN instruction

[compsystems]

in all the languages I've programmed the RETURN instruction end the function
Why not the case in the language of hpprime?

Code:

#cas
prg1(x,y):=
BEGIN
  a:=seq(x^2,x,1,3);
  return a;
   √(x^2+Y^2);  
END;
#end

prg1(3,4) [ENTER] => [1,4,9] OK & not 5