End activation without return

[kkerchmar-bbg]

Hi, can you tell me if there is any way to terminate an activation without there being a return of any sort?

I want to do something like:

{
A;
B;
A -> B
A -> B
}

which renders as:

I want the first activation on the B lifeline to have ended before the second. I do not want the second activation to have this weird overlap with the first one.