Frank Martin: Do I look like a man who came half-way across Europe to die on a bridge?
Valentina: Am I not sexy?
Frank Martin: ... Yeah, you're sexy.
Valentina: You're the gay!
Frank Martin: No! I am not "the gay."
Frank Martin: Let me guess. You're the smart one.
Enormous thug: No. I am the big one.
Answer: Deactivating a complex bomb like that would have taken time, which Frank did not have and he was being monitored by high tech hardware.