Lewis Snart: [Leonard is pointing cold gun at the Flash]
[Lewis Snart to his own son, Leonard]
Lewis Snart: Kill him
[the Flash]
Lewis Snart: or you will never see your sister
[Lisa]
Lewis Snart: alive.
[threatens as if to trigger the device that would explode the Thermite bomb he has put in the neck of his own daughter, Lisa]
Lewis Snart: [Leonard is about to press trigger of the cold gun on the Flash]
Lisa Snart: [at S.T.A.R labs, Cisco is about to removes the bomb from Lisa's body, but hesitates as the bomb could explode, killing Lisa and all of them. Lisa to Cisco] Do it Ciso.
Cisco Ramon: [at S.T.A.R labs, Cisco removes the bomb from Lisa's body, exclaims] I got the Bomb out.
[the Flash hears it through his device]
Leonard Snart: [to Leonard] Lisa is safe.
[Leonard blasts the cold gun at the chest of his own father, Lewis]
Lewis Snart: [Falls and is dying. A block of ice has penetrated his chest and heart. Groans. Says To Leonard] You were working with the Flash. I thought you hated him.
Leonard Snart: not as much as I
[long pause]
Leonard Snart: hate you.
[Lewis gasps, falls and dies. Ice block in his chest shatters]
The Flash: [takes the cold gun from Leonard. Asks him] Lisa was safe. Why did you do that?
Leonard Snart: He broke my sister's heart. Only fair I break his.
[Father Lewis has been child abusing his own daughter, Lisa, since she was 7 years. To punish the father for this, Leonard had literally jabbed ice in to the heart of the father, killing him]