We present a novel approach to enhance avalanche companion rescue using wearable sensing technologies. The time to find and extricate victims is most crucial: once buried by an avalanche, survival chances drop dramatically already after the first 15 minutes.
avalanches can be deadly
The context states that 'survival chances drop dramatically already after the first 15 minutes.' which must mean that some people don't survive. It is therefore correct to say avalanches can be deadly. The system could likely not understand that by saying survival chances drop, it means there is a chance that some people don't survive. 
( z1 possible :ARG1 ( z2 kill :ARG0 ( z3 avalanche ) ) )